通信工程专业英语考试试卷

第一课1.将下述句子译成英文。

(1) An analog information source produces messages that are defined on a continuum, whilea digital information source produces a finite set of possible messages.(2) The beacon-fire tower in ancient China was a communications system.(3) Show that the entropy is a maximum when the probability of sending a binary 1 is equalto the probability of sending a binary 0 .(4) Information capacity is a measure of how much information can be transferred through acommunications system in a given period of time .(5) The wider the bandwidth and the longer the time of transmission, the more informationcan be conveyed through the system .2.Answer the following questions :(1) Samuel Morse developed the first electronic communications system in 1837 .(2) Y es.(3) The vacuum-tube triode .(4) Hartley’s law simply states that the wider the bandwidth and the longer the transmissiontime, the more information that can be conveyed through the system . The Shannon’s formula is I=B log2(1+S/N) , where I=information capacity(bps), B=bandwidth(Hz), S/N=signal-to-noise power ratio(unitless) .(5) (a) VLF, (b) MF, (c) SHF第二章信息源1.根据课文回答下列问题。

通信专业英语复习题Part B一、基础词汇1.Inductor电感2.Alternative Curren t交流电流3.DC直流4.Plastic 塑料5.LED发光二极管6.fuse保险丝7.Electric Potential 电势能8.V oltage电压9.Ohm’s Law欧姆定律10.Solid 固体12Rectifier 整流器13.Bias 偏置14.FET 场效应晶体管15.Frequency Drift 频率漂移16.Temperature Drift温度漂移2.OA 18.Gain 增益19.Couple耦合20.Feedback 反馈21.Crystal Oscillator晶体振荡器22.Conversion 转换23.Phase Detector鉴相器24.Local Oscillator 本机振荡器25.ANT SWITCH天线开关26V oltage Controlled Oscillator 压控振荡器27.Ethernet 以太网28.Configure 配置29.Digital Interface数字接口30.Frame Relay 帧中继31.TCP 传输控制协议32.PCS 个人通信系统33.DNS 域名服务器34.decode 解码35.Description概述3.36.Base Station基站37.Mobile 移动39.Transmitter 发送器40.Receiver接收器二、词汇缩写与翻译1.High Fidelity，缩写HI-FI，中文翻译高保真；2.Field Effect Transistor，缩写FET，中文翻译场效应晶体管；3.Central Processing Unit,缩写CPU ，中文翻译中央处理机；4.Carrier Sense Multiple Access，缩写CSMA，中文翻译载波监听多址访问；5.Digital to Analog Converter，缩写DAC ，中文翻译数模转换器；6.Arithmetic Logic Unit，缩写ALU，中文翻译算术逻辑单元；7.American National Standards Institute，缩写ANSI，中文翻译美国国家标准协会；8.Asynchronous Transfer Mode，缩写ATM，中文翻译异步传输模式；9.Bit Error Ratio，缩写BER ，中文翻译误码率；mon Traffic Channel，缩写CTCH，中文翻译公共业务信道；11.Enhanced Data rates for GSM Evolution，缩写EDGE，中文翻译增强型的GSM环境；12.Frequency Division Duplex，缩写FDD ，中文翻译频分双工；13.Global Positioning System，缩写GPS ，中文翻译全球定位系统；14.Media Access Control，缩写MAC ，中文翻译媒体访问控制；15.Mobile Broadcast Wireless Access，缩写MBWA ，中文翻译移动广播无线接入；16.Operation And Maintenance center，缩写OMC ，中文翻译操作维护中心；17.Orthogonal Variable Spreading Function，缩写OVSF ，中文翻译正交可变扩频函数；18.Primary Synchronization Code，缩写PSC ，中文翻译主同步码；19.Real Time Protocol，缩写RTP ，中文翻译实时协议；20.Total Access Communications System，缩写TACS ，中文翻译全接入通信系统；21.Universal Asynchronous Receiver/Transmitter，缩写UART ：中文翻译通用异步收发器；22.Wireless Fidelity，缩写WIFI ，中文翻译无线网；23.Wideband Code Division Multiple Access，缩写WCDMA，中文翻译宽带码分多址；Watch Dog Timer，缩写WDT，中文翻译监视计时器；24.Quadrature Amplitude Modulation，缩写QAM ，中文翻译正交幅度调制；25.Quadrature Frequency Shift Keying，缩写QFSK ，中文翻译正交频移键控；26.Signal to Noise Ratio，缩写SNR，中文翻译信噪比；27.Signaling Transport Converter，缩写STC，中文翻译信令传送转换器；28.Ultra Wideband，缩写UWB，中文翻译超宽频；29.Universal Subscriber Identity Module，缩写USIM ，中文翻译通用用户识别模块；三、词汇识别英文名称中文名称TD-SCDMA时分同步的码分多址Base Transceiver Station 基站收发信台Cell Broadcast Service小区广播业务Downlink Shared Channel 下行共享信道Forward Quick Paging Channel 前向快速寻呼信道Fast Fourier Transform 快速傅里叶变换LAN局域网Data Link Layer 数据链路层Integrated Services Digital Network 综合业务数字网LCR低码片速率PICH寻呼指示信道Signaling Connection Control Part 信令连接控制部分Traffic 交通Service Specific Connection Oriented Protocol 面向连接的特定业务协议TDMA时分多址接入Wireless Router 无线路由器BCCH广播控制信道Three layer switch三层交换机Topology Structure 拓扑结构Cyclic Redundancy Check 循环冗余检验Spreading Spectrum 扩频FER误帧率Frequency Hopping 跳频Mask code掩码Static Route table 静态路由表Wide Area Network 广域网Open Short Path First 开放最短路径优先IGP内部网关协议HDLC高级数据链路控制Authentication Center 鉴权中心AICH 捕获指示信道Access control layer访问控制层Adaptation Multiple Rate 自适应多速度Hybird Phase Shift Keying 混合相移键控Power Management IC 电源管理芯片Low Noise Amplifier 低噪放大器OSI开放式系统互联Signaling System #7 7号信号系统五、专业英语应用（一）阅读以下英文资料，回答相应问题。

通信英语I单项选择1．抽样频率a. sampling rateb. repetition ratec. sampling frequency答案：c2．数字通信a. digital communicationb. digital transmissionc. transmissionpath答案：a3．帧格式a. synchronization wordb. frame formatc. reverse operation答案：b4．噪声功率a. noisy environmentb. signal levelsc. noise power答案：c5．含噪声的环境a. signal levelsb. noisy environmentc. noise power答案：b6．模拟信号a. speech channelb. analog signalc. amplitude value答案：b7．脉冲流a. stream of pulsesb. receiving terminalc. terrestrial system答案：a8．传输路由a. transmission pathb. transmission qualityc. binary transmission答案：a9．互联网a. network resourceb. Internetc. interconnected systems答案：b10．命令a. copyb. hostc. command答案：c11．拷贝a. addressb. mousec. copy答案：c12．搜索工具a. user interfaceb. searching toolsc. electronic mail答案：b13．存取a. accessb. protocolc. copy答案：a14．网络资源a.textual messagesb. remote terminalsc. network resources答案：c15．文本信息a. information servicesb. hypertext protocolc. textual messages答案：c16．频谱a. bandwidthb. spread spectrumc. frequency band答案：b17．移动手机a. mobile subscriberb. mobile unitc. service performance答案：b18．频带a. frequency spectrumb. frequency bandc. spread spectrum答案：b19．蜂窝交换机a. cellular switchb. cellular sitec. mobile unit答案：a20．单边带a. single-sidebandb. bandwidthc. service area答案：a21．服务区a. service areab. service performancec. service capability答案：a22．移动用户a. mobile unitb. mobile subscriberc. mobile transceiver答案：b23．微处理器a. subsystemsb. utilizationc. microprocessor答案：c24．无线机架a. radio cabinetb. antennac. mobile unit答案：a25．电路交换a. packet switchingb. circuit switchingc. message switching答案：b26．分组交换a. packet switchingb. circuit switchingc. message switching答案：a27．报文交换a. packet switchingb. circuit switchingc. message switching答案：c28．专用电路a. dedicated circuitb. error controlc. return signal答案：a29．突发性a. burstyb. randomc. header答案：a30．传输时延a. destination addressb. transmission delayc. return signal答案：b31．中间交换设备a. given maximumb. intermediate switching equipmentc. store-and-forward manner答案：b32．子网a. headerb. subnetc. busty答案：b33. 公众电信网a.public telecommunication networkb. intermediate switching nodec. circuit- switched network答案：a34.半双工的a. full-duplexb. half-duplexc. external call答案：b35. 端局a. toll centerb. end officec. tandem switch答案：b36. 外部呼叫a. external callb. data trafficc. toll center答案：a37.链路a. trunkb. linkc. route答案：b38.交换节点a. intermediate switching nodeb. voice-frequency circuitc. switching node答案：c39.音频电路a. telephone subscriberb. voice-frequency circuitc. two wire connection答案：b40.拓扑a. internodesb. topologyc. route答案：b41.二线连接a. data trafficb. end officec. two wire connection答案：c42.数据流量a. data trafficb. tandem switchc. toll center答案：a43.全球通信a. interface equipmentb. global communicationc. communication carriers答案：b44.脉码调制a. pulse code modulationb. voice encodingc. open network答案：a45.接口设备a. switching equipmentb. transmission mediumc. interface equipment答案：c46.综合业务数字网a)end-to-end digital connectivityb. international organization for standardizationc. integrated services digital network答案：c47.通信载体a. communication carriersb. transmission mediumc. interface equipment答案：a48.系统结构a. infrastructure c. flexibility d. basic access答案：a49.蜂窝式移动电话a. cellular switchb. cellular mobile telephonec. cellular site答案：b50.数据传输a. data transmissionb. transmission errorc. error flag答案：a51.传号电平a. space levelb. logical levelc. mark level答案： c52.接收机的定时a. intersymbol spaceb. serial interfacec. receiver timing答案：c53.明显的缺点a. transmission errorb. obvious disadvantagec. error flag答案：b54. 起始位a. start bitb. stop bitc. parity bit答案：a55.空号电平a. mark levelb. space levelc. the idle state答案：b56.控制比特a. binary datab. local clockc. control bit答案：c57.串行接口a. data streamb. CRT terminalc. serial interface答案：c58.发送器和接收器a. transmitter and receiverb. receiver timingc. duration of T seconds答案：a59.二进制数据a. binary datab. data streamc. data transmission答案：a60.高速电子开关a. the voice channelb. the repetition ratec. a high-speed switch答案：cII.根据所给英文选择合适的答案1．digital communicationa.全球通信b. 公共通信载体c.数字通信答案：c2．voice encoding techniquesa.语音编码技术b. 脉冲c. 脉冲编码调制答案：a3．basic access signaling ratea.大量的接口设备b. 基本接入信令速率c. 统一的接入答案：b4．the International Organization for Standardizationa.综合业务数字网b. ISDN的标准和系统结构c. 国际标准化组织答案：c5．end-to-end digital connectivitya. 基本接入信令速率b.端对端的数字连接c. 语音编码技术答案：b6．progressive application of digital technologya.由于传输媒体导致的质量下降b.4KHz 话路中所固有的带宽限制c.数字技术的逐步应用答案：c7．enhanced qualitya.高质量b. 带宽的限制c.统一的接入答案：a8．the branches between nodesa.节点间的支路b. 中间交换节点c. 全双工的连接答案： a9．tree topologya. 双绞线b. 结构部件c. 树状拓扑答案：c10．backbone hierarchical networka. 国家网络b. 被分离开的子网c. 主干体系网络答案：c11．the subscriber that transmit digital signala. 发送数字信号的用户b. 一小部分用户c. 相邻的端局答案：a12．multiple voice-frequency circuitsa. 高效中继线b. 多音频电路c. 同步时分复用答案：b13．the function of concentrating traffica.集中话务量的功能b. 路由选择的基本次序c. 发送数字信号的用户答案：a14．full duplexa. 全双工的连接b. 全连通性c. 全双工的答案：c15．transmission facilitiesa. 传输设备b. 交换区c. 高效中继线答案：a16．switching techniquea.交换技术b. 电路交换c. 分组交换答案：a17．message switchinga.交换技术b. 报文交换c. 分组交换答案：b18．communication partiesa.传输单元b. 通信各方c. 返回信号答案：b19．the special signaling messagea. 存储转发传输技术b. 带宽的动态分配c. 特定的信令信息答案：c20．low channel utilizationa. 低的电路利用率b. 报文整个的传输时延c. 传输单元答案：a21．total path of connected linesa. 连线的整个通路b. 源到目的地的一对c. 带宽的动态分配答案：a22．radio cabineta. 无线通信行业b. 无线机架c. 多径衰耗答案：b23．telephone company zone officesa.移动收发信机b. 电话公司地方局c. 中央协调单元答案：b24．available radio frequency spectruma. 所分配的频带b. 调频广播业务c. 可用的无线电频谱答案：c25．central coordinating elementa. 中央协调单元b. 试验性的蜂窝系统c. 有限的服务能力答案：a26．severe spectrum limitationsa.严厉的频谱限制b. 有限的服务能力c. 有限的指定频带答案：a27．developmental cellular systema. 频谱利用率b. 试验性的蜂窝系统c. 传统移动电路的运行限制答案：b28．propagation path lossa. 调频广播业务b. 传输路径衰耗c. 无线机架答案：b29．backbone systema.主干系统b. 电子会议c. 远程终端答案：a30．live conversationa.最大的信息库b. 文本信息c. 实时的对话答案：c31．textual messagesa.搜索工具b. 万维网c. 文本信息答案：c32．the networked hypertext protocola.联网的超文本协议b. 网络设备资源c. 全国范围的网络答案：a33．the Unix operating systema. 主干系统b. 万维网c. Unix 操作系统答案：c34．the vast majority of the computers on the neta.在网上的绝大多数计算机b. 分布在全世界的计算机的巨大网络c. 全国范围的网络答案：a35．remote terminala. 电子会议b. 远程终端c. 文本信息答案：b36．the largest repository of informationa. 最大的信息库b. 实时的对话c. 方便的搜索工具答案：a37．the time division multiplexera. 时分多路复用b. 高速的电子开关c. 时分多路复用器答案：c38． A high-speed electronic switcha. 高速的电子开关b. 被传信号的波形c. 时分多路复用答案：a39．time Division Multiplexinga. 时分多路复用b. 时分多路复用器c. 地面系统答案：a40．the presence or absence of the pulsea. 一串幅值b. 每样值8 位码c. 脉冲的“有”或“无”答案：c41．the unique or absence of the pulsea. 脉冲的“有”或“无”b. 被称为同步字的独特的码序列c. 将抽样的幅值转换成一串脉冲的单元答案：b42． A sequence relating to channel1, 2 and so ona.涉及到第一路、第二路及其他各路的序列b.一条特定消息中的全部信号c.理论上的最小采样频率答案：a43．the schemes for performing these three functionsa. 电话质量的话路b. 由卫星上收到的信号c. 实现这三项功能的方案答案：c44． a series of amplitude valuesa.一串幅值b. 被传信号的波形c. 每样值8位码答案：a45． A speech channel of telephone qualitya. 实现这三项功能的方案b. 将抽样的幅值转换成一串脉冲的单元c. 电话质量的话路答案：c46． A sequence of 8-binary digitsa. 每样值8位码b. 一个8位二进制序列c. 一串幅值答案：b47． A minimum theoretical sampling frequencya. 理论上的最小采样频率b. 抽样量化和编码c. 将抽样的幅值转换成一组脉冲的单元答案：a48．the sparking of a car ignition systema. 高速电子开关b. 理论上的最小采样频率c. 汽车点火系统的打火答案：c49．the stream of the pulses with a repetition rate of 64KHza. 真实信号与噪声信号的关系b. 由传输路由引入的衰减c. 重复率为64KHz的脉冲流答案:c50．the relationship of the true signal to the noise signala. 真实信号与噪声信号的关系b. 脉冲的有和无c. 被称为同步字的独特的码序列答案：a51．terrestrial systema. 高速电子开关b. 地面系统c. 时分多路复用答案：b52．asynchronous serial data transmissiona. 数据链路面向字符的特征b. 异步串行数据传输c. 异步串行接口答案：b53．isolated subnetworksa. 被分离的子网b. 高效中继线c. 交换区答案：a54．two subscribers attached to different end officesa. 在站和网络之间的接口b. 路由选择的基本次序c. 连到不同端局的两个用户答案：c55．synchronous TDMa. 同步时分复用b. 多条音频电路c. 节点间的之路答案：a56．the clocks at the transmitter and receivera. 符号间空格持续时间的三倍b. 在字符后所收到的奇偶校验位c. 发送器和接收器时钟答案：c57．the transmitted dataa. 电传机时代b. 一个字符的点和划c. 所发送的数据答案：c58．the falling edge of the start bita. 起始位的下降沿b. 停止位的下降沿c. 电传机时代答案：a59．the group of bits called charactersa. 数据链路面向字符的特征b. 在字符后所收到的奇偶校验位c. 被称为字符的比特组答案：c60． A clock generated locally by the receivera. 最为流行的串行接口b. 由接收机本地产生的时钟c. 发送器和接收器的时钟答案：bIII.选择合适的答案1.Furthermore, we shall prove that a minimum theoretical sampling frequency of order 6.8KHz is required ( ) a voice channel ( ) the range 300 Hz to 3.4KHz.a. convey , occupyb. to convey, occupyingc. conveying , occupiedd. convey, to occupy答案：b2. For example, the signal ( ) from a satellite, ( ) in far outer space, is very weak.ａ. received, located b. receive, locate c. receiving, locatingd. to receive, to located答案：a3. If we consider binary transmission, the complete information about a particular message will always ( ) by simply ( ) the presence or absence of the pulse.ａ.obtain, detect b. be obtained, detecting c. obtained, detected d. obtaining, detected答案：ｂ4. There is a inherent advantage for ( ) noisy environments by ( ) digital transmission.ａ．overcoming, choose b. overcome, choosing c. overcome, choose d. overcoming , choosing答案：d5. Each voice channel has a separate coder, the unit ( ) converts sampled amplitude values to a set of pulse; and decoder, the unit ( ) performs the reverse operation.ａ．who, who b. when, when c. where, where d. that , that答案：d6. The problem is easily overcome by ( ) a frame format, where at the start of each frame a unique sequence of pulses is placed ( ) the start of the frame.a.specify, identifyb. specifying, so as to identifyc. specified, identifiedd. specify, identifying答案：b7. It was ( ) in 1969, when the U.S. Department of Defense establisheda nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to connect答案：b8. If somebody else had something interesting ( ) on their computer, it was a simple matter ( ) a copy.a.stored, to obtainb. to store, obtainedc. storing, obtainingd. store, obtain答案：a9. The Internet is a huge ( ) systems, but it users just a handful of method ( ) data around.a.interconnect, moveb. interconnected, to movec. to interconnect, movedd. interconnecting, moving答案：b10. The most commonly ( ) is electronic mail (E-mail) , or simply as mail, Mail permits network users ( ) textual messages to each other.e, sendb. to use, sentc. used, to sendd. using , sending答案：c11. Today thousands of network s and millions of computers ( ) the Internet.a.are connected tob. connected toc. to connectd. connecting to 答案：a12. The simplest way ( ) a file on another host is to copy it across the network to your local host, FTP can do this.a.accessb. to accessc. accessedd. success答案：b13.One of many reasons for ( ) a cellular mobile telephone system and ( ) it in many cities is the conventional mobile telephone system.a.develop, deployb. to develop, to deployc. developing, deployingd. developed, deployed答案：c14. The ideal mobile telephone system would operate within a ( ) signed frequency band and would serve an almost ( ) number of users in ( ) areas.a.limited, unlimited, unlimitedb.limitation, limitation, limitationc.limit, limit, limitd. limiting, limiting, limiting答案：a15. LSI technology and mass production contribute to reduced cost ( ) in the future an average-income family should be able ( ) a mobile telephone unit.a.Which, affordingb. that, affordedc. when, affordd. so that, to afford答案：D16. Microprocessors and minicomputers are now ( ) for controlling many complicated features and functions with less power and size ( ) was previously possible.a. used, thanb. use, thisc. using, theyd. usage, it答案：a17. On Jan.4,1979, the FCC ( ) Illinois Bell Telephone Co. ( ) a developmental cellular system in the Chicago area and make a limited offering of its cellular service to the public.a. authorize, conductb. authorizing, conductingc. authorized, to conductd. to authorize, conducted答案：c18. Why 800 MHz? The FCC’s decision ( ) 800 MHz was ( ) because of severe spectrum limitations at lower frequency band.a.to choose, madeb. choose, to makec. choice, maked. choice, making答案：a19. The switch, ( ) circuit switches, have no capability of ( ) user’s data on their way to the destination.a. calling, storedb. called, storingc. to call, to stored. be called, be stored答案：b20. The circuit is set up by a special signaling message ( ) finds its way through the network, ( ) channels in the path as it proceeds. a. that, seizing b. where, seizingc. who, seizedd. one, be seized答案：a21. –The switching element is a computer ( ) a message processor, with processing and storage capabilities. Message travels independently and asynchronously, ( ) their own way from source to destination.a. to call , findb. calling, foundc. referred to as, findingd. be called, sending答案：c22. A variation of message switching is packet switching. Here the message is broken up into several pieces of a ( ) maximum length, ( ) packets.a. given, calledb. give, callc. giving, callingd. to give, to call答案：a23. The telephone contains a transmitter and receiver for ( ) back and forth ( ) analog voice and analog electrical signals.a. convert, inb. converting, betweenc. conversion, tod. converted, into答案：b24. Each subscriber connects ( ) local loop to a switching center, ( ) as an end office.a. to, callingb. with, knownc. the , knowd. via, known答案：d25. The trunks are designed ( ) multiple voice-frequency circuits ( ) either FDM or synchronous TDM.a. carry, useb. carried, usedc. to carry, to used. to carry, using答案：d26. Although originally to service analog telephone subscribers, the telephone network handles substantial data traffic ( ) modem, and gradually being converted to a digital network.a. implemented, viab. implementing, inc. to implement, withind. design, on答案：a27. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers or nodes. a. organization, consist b. organize, consistingc. to organize, consisting ofd. organizing , to consist答案：c28. ISDN’s enormous importance is only gradually being ( ) . Years of work have been ( ) by the CCITT and the ISO.a. understand, carryb. understanded, carriedc. to be understood, to carryd. understood, carried out答案：d29. The term ISDN was first defined within the CCITT in 1972. It referred to a network ( ) end-to-end digital connectivity ( ) a range of services.a. providing, forb. provision, toc. provided, withd. provide, into答案：a30. Similarly, the introduction of voice encoding techniques ( ) pulse code modulation contributed ( ) the ISDN’s concept evolution.a. usage, onb. using, toc. use, withd. used, so as to答案：b31. The enhanced quality is achieved when a signal is digitally encoded ( ) degradation ( ) the transmission medium.a. overcome, tob. overcame, withc. overcoming, overd. to overcome, due to答案：d32. As regards economy, early studies suggested that digital services ( )significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：d33. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：a34. If we consider binary transmission, the complete information abouta particular message will always ( ) by simply ( ) the presence or absence of the pulse.a. obtain, detectb. be obtained, detectingc. obtained, detectedd. obtaining, detected答案：b35. An asynchronous serial data link is said ( ) character oriented, as information is transmitted in the form of group of bits ( )characters.a. be, callingb. to being, to callc. been, calld. to be, called答案：d36. It was ( ) in 1969, when the U.S Department of Defense establisheda nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to define答案：b37. Thus was born a new, but perpetually ( ) paging services ( ) ata one-way selective signaling system without speech.a. developing, consistingb. organize, consist ofc. develop, defined. to develop, to define答案：a38. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers.a. organizing, consistingb. organize, consist ofc. to organize, consisting ofd. to organize, to consist of答案：cIV.根据课文内容选择正确答案1.The integrated services digital network is the road map to the future for ( ).A.all forms of data communicationsB.all forms of digital communicationsC.all voice conversationsD.all personal communications答案：B2. The digital service offered the public carriers three very appealing characteristics: ( ) , economy, and flexibility.A. social abilityB. great capacityC. high speedD. enhanced quality答案：D3. As regards economy, early studies suggested that digital services offered significant advantages since the substantial quantity of interface equipment in the telephone exchange ( ).A. could be eliminatedB. could be usedC. could be decreasedD. could be widely used答案：A4. Today two 64 kbit/s, or 2B-channels coupled with a basic access signaling rate of 16 kbit/s, the D-channel, constitute ( ).A.the information superhighwayB.the local area networkC.the essential ISDN transmission rateD.the synchronous digital hierarchy答案：C5. Currently PSTN offers universal voice access to almost 750 million telephone around the world. ISDN is the network which will provide a similar universal access for ( ).A.voice service as wellB.not only voice but data, video, text, and other services as wellC.any analog information including voiceD.high speed data service答案：B6. The public telecommunications network can be described ( ).ing twisted pair of wiresing many thousands of subscribersing four generic architectural componentsing switching nodes答案：C7. The local loop is a pair of wires, generally twisted pair, that ( ).A.connects a subscriber to one of the nodes in the networkB.connects trunk in the networkC.attaches to the toll centerD.attaches to the primary center答案：A8. If the two subscribers are under the aegis of different regionalcenters, the circuit ( ).A.will involve a digital data systemB.will involve a trunk between regional centersC.will involve a PBX facilityD.will involve many end offices答案：B9. Each subscriber c9onnects via local loop to a switching center, known as ( ).A. a regional centerB. a tandem switchC. an end officeD. a telephone network答案：C10. There are over 19,000 end offices in the United States, so it is clearly impractical ( ).A.for each end office to have a direct link to each other end officeB.for the US to build so many switching centersC.for each end office to provide video serviceD.for each end office to support many thousands of subscribers答案：A11. With the introduction of digital data system, some subscribers that ( ) have been incorporated into the network.A.can provide video serviceB.transmit broadband programC.contain a transmitter and receiverD.transmit digital signals答案：D12. ( ) , a total path of connected lines is set up from the origin to the destination at the time the call is made, and the path remains allocated to the source-destination pair until it is released by the communication parties.A. In message switchingB. In packet switchingC. In circuit switchingD. In digital switching答案：C13. In message switching, the transmission unit is a well defined block of data called a message. In addition to the text to be transmitted, a message comprises ( ).A. a start and end of dataB. a header and checksumC. a start and a stop bitD. a transmitter and receiver答案：B14. A variation of message switching is packet switching. Here the message is broken up into several pieces of a given maximum length, ( ).A. called informationB. called textsC. called packetsD. called messages答案：C15. The header of a message contains information regarding ( ); thechecksum is used for error control purposes.A. the text to be transmittedB. the source and destinationaddressesC. the voice channelsD. many packets between two computers答案：B16. With circuit switching, there is always an initial connection costincurred in setting up the circuit. It is cost-effective only in those situations where once the circuit is set up ( ).A.the voice conversation beginsB.there is no any intervention on the part of the subnetC.there is a message to be transmittedD.there is a guaranteed steady flow of information transfer答案：D17. A major problem facing the radio communication industry is the limitation of ( ).A.the LSI technologyB.the poor service performanceC.the available radio frequency spectrumD.the size of the mobile transceivers答案：C18. Large-Scale Integrated circuit technology reduced ( ) so thatthey easily fit into the standard automobile.A.the costs of the transceiversB.the size of mobile transceiversC.the number of the channelsD.the frequency band of the transceiver答案：B19. A basic cellular system consists of three parts: a mobile unit,( ).A.a cell site, and a mobile telephone switching officeB.a cellular processor and a cellular switchC.a control unit and a power plantD.an antenna and a data terminal答案：A20. Each mobile unit can only use one channel at a time for itscommunication link, ( ).A.the channel is fixed when the call is madeB.but the channel is not fixedC.and the channel is a high-speed data linkD.and many mobile units use the same channel答案：B21. The cellular switch, which can be either analog or digital,switches calls ( ).A.to connect mobile subscribers to the nationwide telephone networkB.to connect fixed telephone subscribers to one anotherC.to link together many fixed telephone usersing the microwave radio links答案：A22. People on the ARPNET quickly discovered that they could ( ) .municate to one another by telephoneB.exchange messages and conduct electronic “conferences”withdistantC.conduct data communicationsD.get all kinds of information services, such as science, education 答案：B23. Today thousands of network and millions of computers are connected to the Internet. It is growing so quickly ( ) how many users “On the Net”.A. that anybody knowsB. that you can tell usC. that anyone can say exactlyD. that nobody can say exactly 答案：D24. The Internet is an international collection of computer networks that ( ), connected together through backbone systems.A.all understand a standard system of addresses and commandsB.all have the bridges and gatewaysC.all use the same addresses and the serversD.all understand importance of communications答案：A25. The Internet is the largest repository of information which can provide very very large network resources. The network resources can be divided into ( ).munication resources and computer resourcesB.servers resources and bridges resourcesC.facilities resources and information resourcesD.hardware resources and software resources答案：C26. As more and more systems join the Internet, and as more and more forms of information can be converted to digital form , ( ).A.the amount of stuff available to Internet users continues to growB.the Internet becomes very busyC.the number of Internet users becomes very largeD.the information in Internet is shared by more people.答案：A27. Before you can use the Internet, you must ( ).A.understand the regulations of the InternetB.choose a way to move data between the Internet and your PCC.install a serverD.study the concept of the communications答案：B28. ( ) is a networked hypertext protocol and user interface.A. Asynchronous serial interfaceB. E-mailC. InternetD. World wide web答案：D29. If the signal is very large compared to the noise level, then ( ).A.the signal-to-noise ratio is poorB.a perfect message can take placeC.it’s a terrestrial systemD.the noise power is very strong答案：B30. If we consider binary transmission, the complete information abouta particular message will always be obtained ( ).A.by detecting the shape of the transmitted signalB.by detecting the level of the transmitted signalC.by calculating the parameters of the transmitted signalD.by detecting the presence or absence of the pulse答案：D31. At the receive terminal ( ) to separate the 8-digit sequences into the appropriate channels.A. PCM is usedB. a demultiplexer is neededC. the frame code is arrangedD. the coder is required答案：B32. It is ( ) which is of the most interest to the communication engineer.A.the method for overcoming noisy environmentsB.the relationship of the true signal to the noise signalC.the binary transmissionD.the quality of the transmission答案：B33. The codec is arranged ( ), and code this value into the 8-digit sequence.A.to do these operationsB.to perform these functionsC.to transmit the voice channelsD.to sample the amplitude value答案：D34. Digital transmission ( ) for overcoming noisy environments.A.provides a programB.provides a powerful methodC.provides the thermal low-level noiseD.provides the signal-to-noise ratio答案：B。

Unit 1四、根据课文内容选择正确答案(正确答案已在题中以"√"表示) -1. If the signal is very large compared to the noise level, then .B. a perfect message can take place (√〉2. If we consider binary transmission, the complete information about a particular message will always be obtained .D. by detecting the presence or absence of the pulse (√〉3. At the receive terminal to separate the 8-digit sequences into the appropriate channels.B. a demultiplexer is needed(√)4. it is which id of the most interest to the communication engineer.B. the relationship of the true signal to the noise signal(√)5.The codec is arranged ,and code this value into the 8-digit sequence.D. o sample the amplitude value 〈√〉6. Digital transmission for overcoming noisy environments.B. provides a powerful method (√)7. The signal is very weak.C. received from a satellite 〈√〉8. The shape of the transmitted signal are most easily affected by the noise and attenuationA. introduced by the transmission path〈√〉9. The demultiplexer knows which group of 8-digits relates to channel 1B. by identifying the synchronization word (√〉Unit 2四、根据课文内容选择正确答案(正确答案已在题中以"J"表示)1. An asynchronous serial data link is said to be character oriented, .C. as information is transmitted in the form of groups of bits called characters (√)2.When the transmitter wishes to send data, it first .A .places the line in a space level (√)3. Then a single parity bit is calculated by the transmitter and |C. sent after the data bits (√)4. The falling edge of the start bit triggers the receiver’s local clock, whichA. samples each incoming bit at its nominal center (√)5. The most obvious disadvantage of asynchronous data transmission isc. the need for a start, parity, and stop bit for each transmitted character (√)6. In fact ,the asynchronous serial data link isB. a very old form of data transmission system (√)7. At the receiving end of an asynchronous serial data link, the receiver continually monitors the lineC. looking for a start bit (√)Unit 3四、根据课文内容选择正确答案(正确答案已在题中以"√"表示):E1. As companies realized they could save money and gain productivity by using networking technology, they .C. added networks and expanded existing networks (√)2. Dividing the network into these seven layers provides a lot of advantages , for example, it facilitates standardization of network components .D. to allow multiple-vendor development and support (√)3. The process of moving information between computers is divided into smaller and more manageable steps in the OSI reference model.A. seven (√〉4. If you want to remember Layer 4,the transport layer, in as few words as possible, think ofA. the flow control and reliability (√)5. The network layer is a complex layer that provides between two host systems that might be located on geographically separated networks.B. connectivity and path selection (√)Unit4四、根据课文内容选择正确答案(正确答案已在题中用"√"表示):..1.TheTCP/IP model has four layers : the application layer,the transport layer,B. the internet layer and the network access layer (√)....2.The purpose of the internet layer is to send source packets from any network on the internetwork and have them arrive at the destination the path and networks they took to get there.D. independent of (√)3.In TCP/IP model, the transport layer supports two protocols:A. Transmission Control Protocol and Use Datagram Protocol (√)4. If you compare the OSI model and the TCP/IP model, you can notice that they have some differences. For example, TCP/IP combinesB. the OSI data link and physical layers into one layer (√)Unit 5四、根据课文内容选择正确答案(正确答案已在题中用"J"表示):|1. Host devices are not part Many layer .They have a physical connection to the network media by having and the functions of the other OSI layers are performed in software inside the host.B. a network interface card (√)2. NICs are considered Layer 2devices because each individual NIC throughout the world carriesa unique code ,calledD. Media Access Control address (√)3. One of the disadvantages of the type of cable that we primarily use, CAT 5 UTP, isC. cable length (√)4.When signals first leave a transmitting station, they are clean and easily recognizable. However, the longer the cable length ,the the signals become as they pass along the networking media.B. the weaker (√)Unit 6四、根据课文内容选择正确答案(正确答案己在题中用"、/"表示):1. Where a repeater typically has only two ports ,a i111b generally has from four to twenty or more ports .Whereas a repeater receives on one port and repeats on the other,C. a hub receives on one port and transmits on all other ports (√)2.Consequently,bridges are concerned only with passing or not passing frames, based onC .their destination MAC address (√)3. The purpose of a router is to examine incoming packets (Layer 3data),choose the best path for them through the network ,and thenC. then switch them to the proper outgoing ports (√)4.Physical,or MAC addresses usually are assigned by the NIC manufacturer and are hard-coded into the NIC-Network-layer addresses, or IP address, or IP addresses ,on the other hand, usually are assignedD. by the network administratorUnit 7四、根据课文内容选择正确答案(正确答案已在题中以"√"表示):|1. People on the ARPNET quickly discovered that they could .B. exchange messages and conduct electronic "conferences "with distant colleagues (√)2. Today thousands of networks and millions of computers are connected to the Internet. It is growing so quickly how many users "On the Net".D. that nobody can say exactly (√)3. The Internet is an international collection of computer networks that ,connected together through backbone systems.A .all understand a standard system of addresses and commands (√)4.The Internet is the largest repository of information which can provide very very large network resources. The network resources can be divided Into .C. facilities resources and information resources (√〉5.As more and more systems join the Internet ,and as more and more forms of information can be converted to digital form,A. the amount of stuff available to Internet users continues to grow (√)6.Before you can use the Internet ,you mustB. choose a way to move data between the Internet and your PC(√)7. is a networked hypertext protocol and user interface.D. World wide web (√)Unit 8四、根据课文内容选择正确答案(正确答案已在题申以"J"表示):1. The first low-loss silica fiber was described in a publication which appeared in October of 1970.The date of this publication is sometimes cited asA. the beginning of the era of fiber communication (√)2. Data rates for installed fiber optic systems have recently moved intoA. the gigabit per second range (√)3. The use of wavelength multiplexing is becoming more wide-spread.A. to increase the fiber information capacity (√)4. Fiber links to the home have been usedB. in demonstration projects (√)5. The wideband subscriber loop systems would provide access to servicesC. such as picturephone(√)6. One of the most important technological developments during the 1980s has been the emergence of as a major international industry.D. optical fibre communication (√)Unit 9四、根据课文内容选择正确答案(正确答案已在题中以"√"表示1. A major problem facing the radio communication industry is the limitation ofC. the available radio frequency spectrum (√)·2. Large-Scale Integrated circuit technology reduced so that they easily fit into the standard automobile.B .the size of mobile transceivers(√〉3. A basic cellular system consists of three parts : a mobile unit, .A. a ceil site, and a mobile telephone switching office(√〉4.Each mobil unit can only use one channel at a time for its communication linkB. but the channel is not fixed (√)5.The cellular switch, which can be either analog or digital, switches callsA. to connect mobile subscribers to the nationwide telephone network (√)Unit 10四、根据课文内容选择正确答案(正确答案己在题中以"飞JJ"表示)h:..l .the speed and rapidity with which the personal communication revolution takes place ,unlike fixed transmission system, highly dependent onC. technology and communication standards (√)!....2.The GSM system is based on which was first proposed as a concept in the 1940s by Bell system engineers in US.B. cellular communication principle(√)3.The cellular concept is defined by two features,A. frequency reuse and cell splitting (√)4.For mobile the three key elements to achieving service take--up are .B. the cost, the size and the weight of the phone ,and the cost and quality of the link(√)5. The interconnection in the fixed telephone service is far more than that in the mobile.A. simple (√)6. The power of the cellular system was that it allowed .C. frequency reuse(√)7.These two forms of information ,tile speech and the data information ,are the usef111part of the transmission ,but have to be supported .A. by overhead information (√)。

XXXXXX大学2015-2016学年第一学期《English for Telecommunication Engineering》期末考试试卷（A卷）考核形式（开卷）第一题、通信工程专业英语常用词组翻译。

（每小题1.5分，共30分）1.将下列英文词组翻译为汉语。

（1）Mobile telephone 移动电话（2）retrieval 检索（3）bandwidth 频带宽度（4）second moment 二阶矩（5）hypermedia 超媒体（6）interface 界面（7）d iscrete media离散介质（8）（8）database 数据库（9）e-commerce 电子商务（10）communication 通信2.将下列汉语词组翻译为英语。

（1）模拟器simulator（2）铸造标记语言Foundry Markup Language（3）投资报酬率return-on-investment（4）纯文本plain text（5）连续介质continuous media（6）语音识别speech recognition（7）万维网World Wide Web（8）虚拟现实virtual reality（9）蓝牙技术bluetooth technology（10）信息技术information technology第二题、英文和汉语词组正确搭配。

（每小组1分，共10分）（a）S tandard Generalized Markup Language 数据信道 f （b）I ntegrated Services Digital Network 网络公司e （c）analog system 全球电子商务联盟g （d）T erminal Adapter 载波信道j （e）d ot-com 模拟系统c （f）data channel 终端适配器 d （g）t he Global E-commerce Consortium 端到端数字连接i （h）b rand commoditization 标准通用标记语言a （i）end-to-end digital connectivity 综合业务数字网 b （j）Bearer channel 品牌商品化 h（每小题5分，共15分）1.Wi-Fi is the trademark for the popular wireless technology used in home networks, mobile phones, video games and other electronic devices that require some form of wireless networking capability.Wifi是流行无线技术的标志，用在家庭网络、移动电话、电子游戏等其他需要某种形式的无线网络容量的电子设备上。

GMDSS通信英语包过500题带答案翻译（不全）GMDSS通信英语500题(带答案)第一部分单项选择题第一章GMDSS通信基础知识001. Which of the following is a required GMDSS function?A. Bridge-to-bridge communications.B. Reception of weather map facsimile broadcasts.C. Both of these.D. None of these.下述哪一项是GNDSS功能所要求的？驾驶台对驾驶台通信A002. Which of the following is a required GMDSS function?A. Transmit and receive location signals.B. Transmit and receive general communications.C. Both of these.D. None of these.下述哪一项是GNDSS功能所要求的？(A发送和接收寻位信号；B 常规通信);两者都是C003. GMDSS is required for which of the followings?A. All vessels capable of international voyages.B. SOLAS Convention ships of 300 gross tonnage or more.C. Vessels operating outside of the range of VHF coastal radio stations.D. Coastal vessels of less than 300 gross tons.GMDSS适用于下面哪一项？300总吨及以上的SOLAS船舶 B004. What is the fundamental concept of the GMDSS?A. It is intended to automate and improve existing digital selective calling procedures and techniques.B. It is intended to automate and improve emergency communications in the maritime industry.C. It is intended to provide more effective but lower cost commercial communications.D. It is intended to provide compulsory vessels with a collision avoidance system when they are operating in waters that are also occupied by non-compulsory vessels.GMDSS的基本概念是什么？在航运业，它用来使紧急通信自动化并提高通信B005. What equipment can be used to receive Maritime Safety Information?A. HF NBDP.B. NA VTESC. EGC receiver.D. All of these.什么设备可以用来接收海上安全信息？(HF NBDP，NA VTEX，EGC receiver )，以上都是D006. Which statement is false regarding the radio operator requirements for a GMDSS-equipment ship station?A. One of the qualified GMDSS operators must be designated to have primary responsibility for radio communications during distress incidents.B. A qualified GMDSS operator, and a qualified backup, must be designated to perform distress, urgency and safety communications.C. Maintaining a record of all incidents connected with the radio communication service which appear to be of importance to safety of life at sea is not required.D. While at sea, all adjustments or radio installations, servicing or maintenance of such installations which may affect the proper operation of the GMDSS station must be performed by, or under the supervision of, a qualified GMDSS operator.关于配备有GMDSS的船台对无线电操作员的要求的描述，下列哪个是错误的？不要求记录对海上人命安全重要的无线电通信业务的有关事件C007. Which statement is false regarding the maintenance of GMDSS equipment at sea?A. The GMDSS operator may not be the person designated to have primary responsibility for radio communications during distress incidents.B. Ships must carry at least one person who qualifies as a GMDSS maintainer for the maintenance and repair of equipment if the at sea maintenance option is selected.C. All at sea maintenance and repairs must be performed by, or under the supervision of a person holding aGMDSS First/Second Class Radio Electronic Certificate.D. The GMDSS maintainer may be the person responsible for ensuring that the watches are properly maintained and that the proper guard channels and the vessel’s position are entered in the DSC equipment.关于海上GMDSS的维修哪一项是错误的？GDMSS操作员不能是遇险事件时的专门通信操作员A 008. What is defined as an area outside sea areas A1, A2 and A3?A. AOR-E.B. AOR-W.C. Coastal and inland waters.D. A4.什么被定义为除A1，A2，A3海区以外的区域？A4 D009. Which radio equipment is not necessary for the ships sailing in the sea area A1?A. NA VTES receiver.B. VHF EPIRB.C. 406MHz EPIRBD. VHF DSC.在A1海区航行的船舶不必配备哪种无线电设备？C010. Which of the following is a functional or carriage requirement for compulsory vessels?A. A compulsory vessel must satisfy certain equipment carriage requirements that are determined by where the vessel sails.B. A compulsory vessel must carry licensed GMDSS operators, the number should be determined by the associated administration.C. A compulsory vessel must be bale to transmit and respond to distress alerts.D. All of these.对强制船舶来讲，下面哪一项是功能或是必要配备？A.强制船舶无论航行在哪里都必须配备某种安全运输设备；B.强制船舶必须配备GMDSS操作员，人数应由主管机关来决定的；C.强制船舶必须发送和回应遇险报警。

通信工程专业英语习题答案练习参考答案第1单元信号与系统1. 完形填空(1) band-limited, cutoff frequencies, to, between, the information rate is proportional to the bandwidth of the channel, on, to, by, by simply increasing the number of levels, noise will cause the receiver to mistake one level for another, no matter how elaborately the data is coded, between, theoretical maxima.(2) from, a loss of information , the twisted pair, addition of noise to the signal, depends on the signal frequency, the high-frequency components of the signal, over, between, through, of, with, including.(3) for, to, In some cases, over, (microwave relay, coaxial cable, or fiber), ADC, to, thereby achieving a reduction in required channel bandwidth, of, signal recovery, (Techniques such as filtering, auto-correlation and convolution).2. 英汉互译(1) “电信”（telecommunication）一词来源于希腊语tele（含义为“遥远的”）和拉丁语communicatio（涵义为“连接”）。

英语阅读一、INTRODUCTION前言1. IMO has decided that all ships over 300TGt must be fitted with a NA VTEX receiver B .A. by 01 Feb 1992B. by 01 Aug 1993C. between 01 Feb 1992 and 01 Feb 1999D. before 01 Feb 19922. Actually实际上, the date for entry into effect will be 1st February C . Though the text does not tell us about it.A. 1995B. 1998C. 1999D. 20003. Every ship constructed建造on or after A shall comply with all the applicable requirements of this chapter.A. 1 February 1995B. 1 February 1992C. 1 July 1997D. 1 February 19994. The GMDSS must combine联合all various subsystems, because D .A. they all have different limitations局限with respect to coverageB. they all have different limitations in the technology技术上they useC. different systems apply to different shipsD. all of above5. The GMDSS is a world-wide communication network combining A with .A. satellite / terrestrial systemB. INMAARSAT/COSPAS-SARSATA. location and capacity of the facilities located on board ships.B. Position and type of a since sectionC. capacity and location of shore based communication facilitiesD. Position and capacity of mobile communication stations.7. The general benefit-of the GMDSS is to A .A. enable SAR operations to start with minimum delayB. give facilities to marine communicationC. reduce sharply突然的the chances of ship’s sinkingD. both A and C8. The quality of the message can be affected影响by A .A. climate气候B. sunshineC. easyD. difficult9. With the help of GMDSS C can be alerted to a distress incident as soon as possible.A. all ships in a large sea areaB. only the sea authorities ashoreC. the SAR units ashore and at seaD. the port radios and the coast stations10. The DSC frequency for distress alerting in Area A2 is D .A. 2182KHZB. 2174.5KHZC. 2192KHZD. 2187.5KHZ11. An area within the coverage of at least one VHF shore station in which continuous DSC distress alert is available is A .A. Sea area A1B. Sea Area A2C. Sea area A4D. distress area12. All ships which, in accordance with the present Convention公约, are required to carry radioA. Q-codeB. Telephone numbers and addressesC. the international Codes of SignalsD. radio instructions13. Every ship shall carry配备personnel人员qualified-for A to the satisfaction满足of the Administration.A. distress and safety radio communication purposesB. life-saving purposeC. GMDSS requirementsD. emergency position14.A means an area within the radiotelephone coverage of at least on a VHF coast station in which continuous DSC alerting is available, as may be define by a Contracting Government.A. Sea Area A1B. Sea Area A2C. Sea Area A3D. Sea Area A415. In addition to meeting the requirements of Sea Area A1, every ship engaged on voyage in Sea Area A2 shall be provided with A .A. MF radio installation with DSCB. SESC. MF/HF radio telephone installationD. 2187.5khz watch receiver16. The GMDSS is composed-of由…组成 A .A. satellite and terrestrial communication systemsB. only navigational and alerting systemsC. just MSI system and locating systemD. SAR co-ordination system17. The complying vessel will transmit ship-to-shore distress alert by B in sea area A1.A. VHF EPIRBB. VHF DSCC. 406mhz S-EPIRBD. both a, b and c18. Sea area A2 is an area within the coverage of at least one B .A. VHF coast stationB. MF coast stationC. satelliteD. RCC19. For ship-to-shore distress alerts, you can use A .A. INMARSAT, EPIRB and DSCB. NA VTEX, NBDP and R/TC. INMARSAT, VHF and SARTD. EPIRB, DSC and radar20. Ship-to-ship distress alerting should be conducted 实施by B .A. INMARSAT SESB. VHF/DSC or MF/DSCC. SART and VHF/DSCD. satellite EPIRB and VHF/DSC21. An area within the coverage of at least one MF shore station in which continuous DSC distress alerting is available is B .A. Sea area A1B. Sea area A2C. Distress areaD. GMDSS areas22. Equipment requirement vary变化according to C .A. Ship owner’s willB. economic conditionC. the area in which the ship operatesD. different orders of all countries23. Sea Area A3 is an area within the coverage of D in which continuous alerting available.A. VHF stationsB. MF/HF stationsA. CH 16B. 2182KHZC. 121.5 MHZD. Ch 7025. What following is not among the functions of SOLAS ships?CA. receive shore-to-ship distress alertingB. transmit ship-to-shore distress alertingC. receive message for public correspondenceD. transmit and receive locating signals26. Which function is the most important one of the GMDSS?AA. alertingB. on-scene communicationC. safety informationD. general communication27. For ships equipped with an SES, it is A and for the operator to send a distress alert.A. easy/reliable可靠的B. difficult/cheapC. stable/compulsory强制的D. easy/expensive28. With the help of GMDSS, D will be rapidly迅速地alerted to the distress incident.A. the SAR authorities shoreB. the ship in the vicinity附近的to casualty意外事故C. the nearest coast stations and port radiosD. a and b29. According to the basic concept概念of the GMDSS, distress alerting can be sent by A toSAR authorities ashore or ships in vicinity of a distress incident.A. either satellite or terrestrial communicationB. only satellite communicationC. only terrestrial communicationD.VHF DSC or SES30. Ships in areas A3 and A4 will transmit, as appropriate D .A. a ship to ship alert on MF/ VHFB. a ship to shore alert by SES/HF DSCC. a ship to shore alert by satellite EPIRBD. all of a,b,c31. Ships of 500 tons gross tonnage and upwards constructed on or after C shall be fitted with a radar installation.A. 1 January 1985B. 1 February 1984C. 1 September 1984D. 1 December 198532. According to the basic concept of GMDSS, D can be rapidly迅速地alerted to a distress incident.A. only SAR authorities on landB. all ships in a very large sea areaC. the nearest coast stations and port radiosA. double frequenciesB. single frequencyC. Dedicated frequencyD. multiple frequencies34. What’s the advantage优势when using the satellites?DA. The message can be directed to the desired locationB. The message can follow the earth’s curvatureC. The quality of message can not be affected by climaticD. The range of the message extend and the quality of reception is improved35. A will form构成the basis for distress alerting and safety calling.111111114174MDSS B. EG47C C. MEI D.DSC36. Every lifeboat which is fitted with a fixed two-way B radiotelephone apparatus装置with an antenna which is separately单独地mounted shall be provided with arrangements for sitting and securing 固定the antenna effectively有效地in its operating position.A. HFB. VHFC. MFD. MF/HF37.Every cargo ship of C tons gross tonnage and upwards shall be provided with at least three two-way VHF radiotelephone apparatus.A. 300B. 400C. 500D. 60038. At least B two-way VHF radiotelephone apparatus shall be provided on every cargo ship of 300 tons gross tonnage and upwards but less than 500 tons gross tonnage.A. oneB. twoC. threeD. four39. Within the polar areas it is A to see a satellite in geostationary orbit.A. impossibleB. possibleC. easyD. difficult40. What information will a distress alert contain?DA. nature of distressB. type of assistance requiredC. course and speed and time at which the information was recordedD. A, B, C are all right41. Bridge-to-bridge communication means D communications between ships from the position from which the ships are normally navigated.A. distressB. urgentC. safetyD. general42. The sitting and installation of accumulator batteries which provide a reserve source of energy shall be such as to ensure确保 D .A. the highest degree of service维修保养B. a reasonable合适的lifetime寿命C. reasonable safetyD. a, b, c are all right43. Why do some stations keep silence?BA. Because they are not engaged in the distress trafficB. They will affect the transmission of that distress trafficC. The powers of these stations are very weakD. They are not in charge of search and rescue44. Stations are grouped by countries arranged in the A order of their country symbolsA. alphabetical按字母顺序的B. figureC. name of stationsD. series45. Having studied the INMARSAT DOCUMENT, gmdss DOCUMENT, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about D .A. the radio regulationsB. the technical terms（条款）and definitions（定义）C. how to operate the GMDSS SES equipmentD. Maritime Communications46. The list of Coast Stations is republished A in a trilingual.三种语言A. every two yearsB. every three yearsC. every yearD. every for years47. From IMO`S point of view, INMARSAT`s most important function is the provision of C .A. general radio communicationB. MSIC. improved distress and safety communicationD. bridge-to- bridge communication49. C communication are intership VHF radio telephone communication.A. ship-to-shoreB. shore-to-shipC. bridge-to-bridgeD. a, b and c50. The is that search and rescue authorities ashore, as well as shipping in the immediate vicinity of the ship in distress, will be rapidly alerted to a distress incident so they can assist in a coordinated SAR operation with the minimum delay.CA. common communication systemB. distress traffic systemC. basic concept（概念）of GMDSSD. SAR operation procedure二、TERRESTRIAL COMMUNICATION SYSTEM1. A means a technique using digital code which enables使能够a radio station to establish contact with, and transfer, information to another station or group of stations and complying with the relevant recommendations of the CCIR.A. DSCB. MSIC. EGCD. NBDP2. The frequency 156.525MHZ and 156.8MHZ should be used in the band of B .A. MFB. VHFC. HFD. LF3. Some radio waves C the surface of the earth because of its .A. are capable of following / distanceB. can follow / altitudeC. can hardly follow / shape性质D. are unable following / angle4. Digital Selective Calling means a technique using A which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.A. digital codesB. code messagesC. noise codesD. distress messages5. If no distress acknowledgement is received C a DSC distress call transmission, then the ship in distress may repeat the DSC distress call attempt after a delay of between 3.5 and 4.5 minutes from the beginning of the initial最初的call.A. relevant toB. relate toC. in response to对…做出反应D. in relation to6. What following is not among the functions of SOLAS ships?CA. receive shore-to-ship distress alertingB. transmit ship-to-shore distress alertingC. receive message for public correspondenceD. transmit and receive locating signals7. Geostationary satellites are the artificial satellites which D .A. always move slowlyB. are in one place onlyC. sometime move sometime don`t moveD. are synchronizing with the movement of the earth8.At least three two-way VHF radiotelephone apparatus shall be provided on every cargo ship oftons gross tonnage and upwards BA. 200B. 300C.400D.8009. It is required that ships proceeding at sea should keep continuous watch on B .A. VHF channel 16 and 13B. Appropriate DSC distress and safety frequenciesC. INMARSAT TDM message channelD.VHF channel 70 and channel 810. The range of a MF coast station is normally B nm.A. 20 to 30B. 200C. 100D. 45011. Every radio installation shall be clearly marked with the A , the ship station identity识别and other codes as applicable for the use of the radio installation.A. call signB. port of registerC. radio nameD. signal label标签12. If a DSC distress relay is transmitted from coast station, it will B .A. indicate the ship in distress that the alert has been receivedB. alert ships in the area of a distress incident that a distress has occurredC. inform other coast station of distress incidentD. repeat the distress alert in 5 minutes13. If the beacon is mounted at a wrong place, it may A by sea water, chemicals, exhaust有害气体and vibrations震动.A. be damagedB. work normally regardless不管of harmful conditionsC. not wok though it is not in a bad conditionD. both a and c14. Radio beacon can be activated C in case of distress.A. only automaticallyB. only manuallyC. both automatically and manuallyD. only by remote control15. The ARQ mode should be applied A .A. when two stations communicate with each otherB. in any radio system and at any timeC. when one ship sends a message to another stationD. for communication among some stations16. The FEC mode is for B from station to two or more other stations when available.A. receiving messages /one stationB. transmission/ one coast station or ship17. What channel is general communication used?CA. any appropriate channel except public communicationB. any appropriate channel except除了for public communicationsC. any appropriate channel besides以及public communicationD. any appropriate channel beside public communication18. General radio communications in the global system are those between D concerning有关的the management and operation of the ships and may have impact-on影响their safety.？？？A. SAR party and the ship in distressB. SAR authorities and the ship in distress and survival craftC. A shop station and any coast stationD. Ship stations and shore-based communication network19. A radio determination测量system based on the comparison比较of reference涉及的signals with radio signals reflected反射, or retransmitted from the position to be determined is B .A. DFB. Radar SystemC. DSC SystemD. COSPAS-SARSAT20. B will normally provide sufficient充足的information to seaward of fairway buoy or pilot station.A. Navarea warningsB. coastal warningsC. local warningsD. Meteorological warnings21. There are some back-up备用satellites in the event万一of failure. If the operational satellite is out of work,C .A. communications in the whole system will stopB. the global system will be damagedC. the back-up one will take its placeD. the whole system will not work22. In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous A alert.A. MF/HFB. SARTC. EPIRBD. any of A, B, C23. Every ship according to Chapter IV of SOLAS shall be provided with D .A. a VHF radio installation capable of transmitting and receivingB. radiotelephony on the frequencies 156.3 MHz（CH06）C. a radar transponder capable of operating in the 9ghzbandD. a, b, c are all right24. Stations in the United States of America are grouped分组by states arranged in the alphabetical order of their C .A. countriesB. statesC. namesD. groups25. Every ship must be fitted with __B__SART, and ____two-way VHF radio telephone.A. 1, 2B. 2, 3C. 2, 1D. 3, 226. A are operated as a secondary method of alerting in the GMDSS.A. satellite EPIRBSB. Non-satellite EPIRBSC. SES and DSCD. a + b27. Which Inmarsat system applies store-and-forward messaging?AA. Inmarsat-CB. SAR operationsC. data processD. continuous broadcast28. In addition to除了…外communication equipment, the GMDSS will introduce requirements of SARTs and EPIRBs designed to improve the C .A. living standardsB. survival conditionC. chance of survivalD. technical specification29. Every ship, while at sea, shall be capable.DA. of receiving shore-to-ship distress alertsB. of transmitting and receiving MSIC. of transmitting and receiving ship-to-ship distress alertsD. A, B, C are all right30. The complying vessels will transmit ship-to- shore distress alert by D in area A4.A.MF DSCB. HF DSCC. 406MHZ S-EPIRBD. Both b and c三、INTERNATIONAL MOBILE SATELLITE COMMUNICATION SYSTEM1. The Network Coordination station for the INMARSAT-F coast stations in the Pacific Ocean region is inA .A. Yamaguchi, JapanB. Beijing, ChinaC. Nakhodka, RussiaD. Perth, Australia2. Any ship with SES can B and through the Inmarsat satellites when sending a distress alert.A. enter the system rapidly / wait for rescueB. have an absolute priority to enter the system / contact with a CESC. establish contact with the RCC / enter the portD. enter the system gradually逐步地/ get the rescue3. The NCS of INMARSAT-F system in the IOR is in B .A. Goonhilly, UKB. Yamaguchi, JapanC. Perth, AustraliaD. Southbury, USA4. Why should the SES operators be very careful when the ship enters the area where three ocean regions overlap重叠? Because D .A. the weather is always terrible恶劣B. the condition there is complicated复杂的C. the signals are too strongD. their SES may receive the signals from unwanted不需要的satellite ？5. D is a space system using one or more artificial人造earth satellites.A. satellite networkB. Satellite LinkC. INMARSATD. Satellite System6. After successful commissioning试运行, the A will permit允许the SES to access to system.A. InmarsatB.IMOC.MSCD.CES7. Who has permit the SES enter the system after successful commissioning?CA. NetworkB. The CES preferred更喜欢by the applicant申请人C. INMARSATD. The SES itself8. The maritime access code for the IOR is C in INMARSAT-A Telex service.A. 581B. 582C. 583D. 5849. The maritime access code of telephone mode in INMAARSAT-A terminal for the POR is B .A. 871B. 872C. 873D. 87410. The maritime access code of telephone mode in INMARSAT-A terminal for the AOR(W) is DA.871B.872C.873D.87411. The maritime access code for the AOR-E is A in INMARSAT-A Telex Service.A. 581B. 582C. 583D. 58412. The maritime access code of telephone mode in INMARSAT-A terminal for the IOR is C .A. 871B. 872C. 873D. 87413. The position if the IOR satellite in the INMARSAT system is A above the equator.A. 64.5EB. 178EC. 15.5WD. 54W14. The Position of the POR satellite in the Inmarsat system is D above the equator.A. 55.5WB. 64.5EC. 15.5WD. 178E15. The position of INMARSAT AOR-W satellite is A above the equator.A. 55.5WB. 180EC. 15.5WD. 64.5E16. A mobile earth station in the maritime mobile-satellite service, which is located on board ship, is calledB .A. an LESB. an SESC. a ship stationD. a Land Mobile Station17. It is quite十分的 B for an SES operator to send a distress alert.A. easy and expensive昂贵B. simple and certain有把握C. dangerous and stableD. simple and certain18. In general, there are two parts in an SES, One of these is antenna equipment also referred to as DA. BDEB. UDEC. AEPD. ADE19. The quality质量of EGC message is C affected by the position of the ship, the time of reception and climatic气象conditionA. sometimesB. all timesC. neverD. partly20. If EGC receiver shares共用a same antenna with INMARSAT MES, it means that it can receive MSIC .A. from any INMARSAT satelliteB. via any appropriate Navtex and EGC stationC. via the satellite the MES is trackingD. from any RCC and coast station21. When you have received GA + from the CES for the INMARSAT-A telex communication. You should immediately select C and you required.A. an CES / telex modeB. an SES telex serviceC. the service / the subscriberD. a satellite / an ocean region22. The INMARSAT system has five major components组成部分, they are:AA. Space Segment, NCC, RCC, SES, and CES错B. Space Segment, a satellite system, C system, NCC and NCSC. Space Segment, NCC, NCS, CES and SES对D. A system, C system, satellite system, earth stations and NCS23. There are B operational satellites in the INMARSAT system covering the whole globe except the Polar Regions.A. 3B. 4C. 8D. 1224. To establish a communication channel for the telex service in the INMARSAT-A terminal, you should first B .A. establish a communication channel from the CES, via the international Telex Network to the final destinationB. set up a communication channel from your SES, via a satellite, to a CES within your ocean regionC. set up a channel directly to the addressee at the destinationD. establish a channel from your terminal, via the International Telex Network to a CES within your ocean region25. The sources of energy能量fitted in GMDSS complying遵从vessels must be.DA. the main source of energyB. emergency source of electrical powerC. the reserve source of energyD. all of above26. A radio link between a transmitting earth station and a receiving earth station through one satellite isnamed a C .A. Radio linkB. Space segmentC. Satellite linkD. upper link27. Each NCS woks as a type of A , assisting controlling and monitoring telex and telephone network as quickly as possible.A. switch operatorB. communication gateway网关C. national operatorD. on-scene commander28. The NCS of INMARSAT-A system in the AOR-E is in D .A. Goonhilly, UKB. Yamaguchi, JapanC. Perth, AustraliaD. Southbury, USA29. An SES operator can chose the most suitable CESs according to D .A. the routing路由agreement for a particular ocean regionB. The communication service he requiredC. the positions of his ship and the CESs.D. B and C30. The Inmarsat system is open for use by D countries on a non-discriminatory basis.A. someB. lots ofC. manyD. all31. The Inmarsat SES operator can choose the most suitable CES according to A .A. his service and positionB. time and courseC. tide and speedD. type of his ship32. During a D period, as a newly-commissioned新开通的SES, your IMN will be past to the other CESs.A. 20 hourB. 12 hourC. 24 minutesD. 24 hour33. What part of the Inmarsat will the SES get access to if the commissioning试运行is successful?BA. The SESB. The space segment部分C. Any CESD. The CES decided清楚by the applicant申请人34. EGC is a A part of INMARSAT.A. component组成部分B. supportable可支持的A. fourB. sixC. fiveD. three36. EGC is a A part of INMARSAT-C.A. local-mode coverageB. SAR operationsC. data processD. continuous broadcast37. In areas covered by Inmarsat HF can be used as an D to satellite communications.A. alternationB. alternateC. alterD. Alternative替代物38. When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will A in a coordinated search and rescue operation with the minimum delay.A. assistB. send a rescue vesselC. search the distress areaD. reach the distress position at once39. The complying vessels can transmit ship to shore distress alerts by at least C .A. One means, whether satellite or terrestrial techniquesB. Two means, whether satellite or terrestrial techniques ？C. Two separate不同的and independent独立的means方式、手段, each using different radio communication servicesD. Two means, such as MF DSC and HF DSC. In INMASAT-A service code 32 B .A. medical assistanceB. medical adviceC. maritime assistanceD. technical assistance70. COSPAS-SARSAT cannot fulfill完成the function of :CA. determining the position of a distress vesselB. both a and cC. distress communicationD. distress alerting and position fixing in Area A471. the beacon located on board aircraft is termed _C____ .A. EPIRBB. PLBC. ELTD. MCC72. for COSPAS-SARSAT system, __B___ transmit distress alert and location information to appropriate rescue authorities all over the world .A. Polar orbiting satellitesB. Ground receiving stationsC. MCCD. ROC73. Distress alerting is usually transmitted to _D____ .A. ships near distress positionB. rescue coordination centerC. all ships in a large areaD. both a and b74. Exchange of answer-backs acts a confirmation that the messages _B____ at the destination.A. have receivedB. have been receivedC. are receivedD. are being received75. The range of a MF coast station is normally _D____ nm.A. 20 to 30B. 200C. 100D. 45076. B__.LUT ___ process the distress signal from EPIRB to determine its position and identity COSPAS-SARSAT B. ground receiving stationsC. storing distress signalD. Near polar orbiting satellites77. A station in the mobile service the emissions of which are intended to facilitate search and rescue operations is __A___ .A. EPIRBB. SARTC. Mobile StationD. Distress Alerting78. Every ship, while at sea, shall be capable.DA. of receiving shore-to-ship distress alertsB. of transmitting and receiving MSIC. of transmitting and receiving ship-to-ship distress alertsD. A, B, C are all right79. Every radio installation shall be clearly marked with the __A___ , the ship station identity and other codes as applicable for the use of the radio installation.A. call signB. port of registerC. radio nameD. signal label80. Bridge-to-bridge communication means _D____ communications between ships from the position from which the ships are normally navigated.A. distressB. urgentC. safetyD. general81. Every lifeboat which is fitted with a fixed __B___ VHF radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.A. one-wayB. two-wayC. double-effectD. one-effect82. Every lifeboat which is fitted with a fixed two-way VHF radiotelephone apparatus with__D___ which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in is operating position.A. a dummy antennaB. a supporting facilitiesC. a back-up equipmentD. an antenna83. At least __C___ two-way VHF radiotelephone apparatus shall be provided on every cargo ship of 300 tons gross tonnage and upwards but less than 500 tons gross tonnage.A. oneB. twoC. threeD. four84. Stations in the United States of America are grouped by states arranged in the alphabetical order of their ___C__.A. countriesB. statesC. namesD. groups85. According to the basic concept of GMDSS, D_____ can be rapidly alerted to a distress incident.A. only SAR authorities on landB. all ships in a very large sea areaC. the nearest coast stations and port radiosD. the SAR authorities ashore as well as ships in the vicinity of the casualty86. Having studied the INMARSAT document, GMDSS document, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about _____A .A. the radio regulationsB. the technical terms and definitionsC. how to operate the GMDSS SES equipmentD. Maritime Communications87. What following is not among the functions of SOLAS ships ?CA. receive shore-to-ship distress alertingB. transmit ship-to-shore distress alertingC. receive message for public correspondenceD. transmit and receive locating signals88. Vessel in distress ___C__ indicate their position by any method.A. cannotB. are no allowedC. have the rightD. should get permission to89. The distress alert should ____C_ the ship in distress.A. identity n. . identical adj.&n. C.identify v.确定识别. identification90. General radio communications in the global system may ___B__ ship’s safety .A. be responsible forB. have an impact onC. commandD. give a guidance to91. In the case of a ship in distress , the need exists to create a temporary暂时的ographic area to ___C__ locating potential assisting ships.A. increaseB. improveC. facilitate帮助促进D. develop92. Distress traffic is the communication ___D__ between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.A. exchangeB. to exchangeC. exchangingD. exchanged93. A SART provides the main means ___B__ a survival craft or the mother ship in distress under the global maritime distress and safety system.A. to locateB. for locatingC. in locatingD. by locating94. The portable SART is designed ___D__ on the bridge in its container.A. to stowB. for stowingC. being stowedD. to be stowed95. What did you say on board ____B_ any part of the message is considered sufficiently important to need safe guarding ?A. whichB. ifC. whyD. that96. The advantage of geo-stationary satellites is __C___ .A. the range of antennal can cover everywhere in the world。

四川理工学院试卷（2016至2017学年第 1 学期）Array课程名称：专业英语命题教师：林国军适用班级：通信20141-20143考试年月日共9 页1、满分100分。

要求卷面整洁、字迹工整、无错别字。

2、考生必须将姓名、班级、学号完整、准确、清楚地填写在试卷规定的地方，否则视为废卷。

3、考生必须在签到单上签到，若出现遗漏，后果自负。

4、如有答题纸，答案请全部写在答题纸上，否则不给分；考完请将试卷和答题卷分别一同交回，否则不给分。

试题一、请将下述词组译成英文（20分，每题0.5分）1．抽样量化与编码2．幅值3．抽样频率4．脉冲流5．模拟信号6．信噪比7．二进制传输8．帧格式9．串行接口10．奇偶校验位11．发送器与接收器12．无线信道13．协议14．波长15．视频带宽16．频谱分配17．切换算法18．基站19．寄存器20．短消息服务21．扩频无线技术22．智能天线阵列23．空间接口技术24．正交频分复用25．减少延迟和干扰26．分组交换27．子网28．报文处理机29．多媒体30．视频压缩31．数字信号处理器32．全活动图像33．硬件、软件和应用34．白噪声35．模拟滤波器36．调制技术37．局域网38．传真机39．成熟的以太网技术40．拨号线二、请将下述词组译成中文（20分，每题0.5分）1. a series of amplitude values2. a sequence of 8-binary digits3. the stream of the pulses with a repetition rate of 64 kHz4. the shape of the transmitted signal5. the attenuation introduced by transmission path6. the unit that converts sampled amplitude value to a set of pulses7. a unique sequence of pulses called synchronization word8. the relationship of the true signal to the noise signal9. asynchronous serial data transmission10. the group of bits called characters11. the falling edge of the start bit12. the invariable units comprising 7 or 8 bits of information13. the character-oriented nature of the data link14. error recovery15. network media access16. electronic conferences17. the largest repository of information18. the convenient searching tools19. the networked hypertext protocol20. optical fiber communications21. fibers with losses approaching the Rayleigh limit22. synchronous transmission system23. 2-dimensional map24. bit-error monitoring25. cellular communication principle26. frequency reuse and cell splitting27. the spread spectrum radio technology used in 3G systems28. the multi-carrier transmission29. the multiple-input multiple-output (MIMO) communications30. the dynamic allocation of the bandwidth31. the overall transmission delay of the message32. message switching33. video compression 34. visual images 35. the standards of multimedia 36. high definition television 37. hard disk storage38. coding algorithms 39. the twisted-pair telephone lines 40. the time division multiplexing 三、请将下述短文译成中文（60分，每题6分） 1. The reader may ask, how does the demultiplexer know which group of 8-digits relates to channel 1, 2, and so on? Clearly this is important! The problem is easily overcome by specifying a frame format, where at the start of each frame a unique sequence of pulses called the frame code, or synchronization word, is placed so as to identify the start of the frame. A circuit of the demultiplexer is arranged to detect the synchronization word, and thereby it knows that the next group of 8-digits corresponds to channel 1.2. So far we have assumed that each voice channel has a separate coder, the unit that converts sampled amplitude values to a set of pulses; and decoder, the unit that performs the reverse operation. This need not be so, and systems are in operation where a single codec is shared between 24, 30, or even 120 separate channels.3. The most obvious disadvantage of asynchronous data transmission is the need for a start, parity, and stop bit for each transmitted character. If 7 bit characters are used, the overall efficiency is only 70 percent. A less obvious disadvantage is due to the character-oriented nature of the data link. Whenever the data link connects a CRT terminal to a computer, few problems arise, as the terminal is itself character oriented.4. A t the receiving end of an asynchronous serial data link, the receiver continually monitors the line looking for a start bit. Once the start bit has been detected, the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver. As each incoming bit is sampled, it is used to construct a new character.5. Before you can use the Internet, you must choose a way to move data between the Internet and your PC. This link may be a high-speed data communication circuit, a local area network, a telephone line or a radio channel. Most likely, you will use a modem attached to your telephone line to talk to the Internet. Naturally, the quality of your Internet connection and service is dictated by the amount of money which you are willing to spend.6. For clarity, a single frame in the serial signal stream can be represented by a 2-dimentional map. The 2-dimentional map comprises 9 rows and 270 columns of boxes. Each box represents a single 8 bit byte within the synchronous signal. Six framing bytes appear in the top left corner of the 2-dimentional map. These framing bytes act as a marker, allowing any bytes in the frame to be easily located.7. The cellular concept is defined by two features, frequency reuse and cell splitting. Frequency reuse comes into play by using radio channels on the same frequency in coverage areas that are far enough apart not to cause co-channel interference. This allows handling of simultaneous calls that exceed the theoretical spectral capacity. Cell splitting is necessary when the traffic demand on a cell has reached the maximum and the cell is then derived into a micro-cellular system.8. In message switching, the transmission unit is a well defined block of data called a message. In addition to the text to be transmitted, a message comprises a header and a checksum. The header contains information regarding the source and destination addresses as well as other control information; the checksum is used for error control purposes. The switching element is a computer referred to as a message processor, with processing and storage capabilities.9. A crucial element in the provision of multimedia is the use of compressed video. Without compression the amount of the storage that would have to be provided by the CD-ROM would be immense, or you would only be able to store 15 seconds of a full motion picture. If compression is applied to the motion pictures experts group standard, then a 650 Mbytes CD-ROM can hold either 72 minutes of video, or 19 hours of audio, or 7000 still photographs.10. An ADSL circuit connects an ADSL modem on each end of a twisted-pair telephone line, creating three information channels－a high speed downstream channel, a medium speed upstream channel, and a duplex telephone channel, depending on the implementation of the ADSL architecture. ADSL depends upon advanced digital signal processing and creative algorithms to squeeze so much information through twisted-pair telephone lines. In addition, many advances have been required in transformers, analog filters, and A/D converters.。

通信专业英语考试习题一、汉译英用户,订购者Subscriber短消息服务SMS信号干扰Signal—jamming天线Antenna移动电话Mobile telephone覆盖率penetration rate预付费业务Pay-as-you-go充电recharge锂离子电池Lithium-ion battery摄像机Camcorder红外连接Infrared connectivity蓝牙连接Bluetooth connectivity个人电脑PC打出的电话Outbound call打入的电话Incoming call主叫方付费Calling Party Pays被叫方付费Receiving Party Pays点对点技术P2P因特网声传协议VoIP通用分组无线服务 GPRS全球移动通信系统GSM主干网Backbone文件分享系统File sharing system重新设置reconfigure视频点播系统video demand service二、填空1、W-CDMA is usually seen as the natural evolution path forGSM and TDMA networks.2、Various network standards may be used in Mobile Broadband, such as GPRS, 3G, WiMAX, UMTS/HSPA, EV-DO and some portable satellite-based systems.2、GPRS 服务is a Mobile Data Service available to users of Global System for MobileCommunications (GSM 系统) and IS-136 mobile phones. It provides data rates from 56 up to 114Kbps4、The most common types of telephone cards are Prepaid cards, Pin cards, Stored-valuecards.5、Trunk telecommunication is a complex type of computer-controlled radio system. ituses a few channels (the actual frequencies), and can have virtually unlimited talkgroups.The control channel computer sends packets of data to enable one talkgroup to talk together, regardless of frequency.6、Broadband Internet Access, shorten to just “broadband”, is high speed Internetaccess—typically contrasted with dial-up access over modem.7、Wi-Fi allows local area networks (LANs) to be deployed部署without cabling forclient devices, typically reducing the costs of network deployment and expansion.8、Wireless network adapters 网卡are now built into most laptops. The price ofchipsets for Wi-Fi continues to drop, making it an economical networking option included in even more devices. Wi-Fi has become widespread in corporate infrastructures.9、The “trunk-line” is time-shared Radio communication over a trunked system issimilar to such telephone system. Trunking a multi-channel radio system increases the efficiency of the radio system by dynamically managing the use of a radio channel.三、简答1、What are major technical standards for the current generation of mobile phone?GSM，CDMA,TDMA,iDEN in the USA，PDC in Japan2、What are major standards for the next generation 3G (IMT2000) phones andnetworks?CDMA-2000 1x RTT，W-CDMA，TD—SCDMA3、How many systems of payment for mobile phones?2 ,one is pay as you go. Another contract based payment3、How many accesses of obtaining Mobile phone power ? What are they?Main power,a USB port,a cigarette lighter socket in a car4、How many types of Mobile phone batteries?3,Nickel mental-hydribe,Lithium-ion,lLthium-Polymer,solar cells5、How to prevent hackers entering your computer?3,Patch up “holes”in the security;use software to control a ccess to the “outside world”;to invset in some decent anti-virus software and to keep this up to date6、What is restrict or limit in mobile broadband?Large data exchanges,P2P file sharing,VoIP,automated feeds四、翻译句子1、All European, African and many Asian countries have adopted a singlesystem—GSM.欧洲，非洲和许多亚洲国家都采用了单一制式的GSM网络。

通信专业英语考试习题通信专业英语考试习题是许多学习通信的学生常常会遇到的挑战。

这些考试题旨在测试学生对通信学科的理解和运用能力。

下面将介绍一些常见的通信专业英语考试习题，希望能对大家备考有所帮助。

一、选择题1. 下面哪个选项是正确的数据通信的定义？A. 使用数字信号而非模拟信号进行信息传输。

B. 使用光纤而非电缆进行信息传输。

C. 使用卫星通信而非微波通信进行信息传输。

正确答案：A2. 通过无线电波进行通信的主要问题是什么？A. 信号的传输距离有限。

B. 频谱资源有限。

C. 安全性问题。

正确答案：B3. 下面哪个选项是正确的带宽定义？A. 数据的传输速率。

B. 可用频谱范围。

C. 数据的传输距离。

正确答案：B4. 频率调制（FM）是通过改变哪个参数来传输信息？A. 频率B. 幅度C. 相位正确答案：A5. 下面哪个选项是正确的对称数字用户线路（DSL）的定义？A. 一种提供高速互联网接入的传输技术。

B. 一种用于长距离电话通信的传输技术。

C. 一种用于数字音视频传输的传输技术。

正确答案：A二、填空题1. OSI模型中，物理层主要负责______________。

答案：将数据转换为适合在通信信道上传输的形式。

2. ___________________是一种广泛用于局域网连接的传输媒介。

答案：双绞线（Twisted Pair）。

三、简答题1. 请简要解释一下分组交换和电路交换的区别和优缺点。

答案：分组交换和电路交换是两种不同的数据传输方式。

电路交换在通信双方建立连接后，会一直占用通信资源直到通信结束；而分组交换将数据划分为小的数据包（分组）进行传输，传输过程中不需要提前建立连接。

电路交换的优点是传输稳定，可以保证实时性，适用于实时语音和视频通信；缺点是资源占用高且不灵活。

分组交换的优点是资源利用率高，适合不同时刻多个用户共享资源；缺点是传输延迟较大，对实时性要求较高的应用不太适用。

2. 请简要解释一下TCP/IP协议族中的IP协议和TCP协议的作用。

通信英语I单项选择1．抽样频率a. sampling rateb. repetition ratec. sampling frequency答案：c2．数字通信a. digital communicationb. digital transmissionc. transmission path答案：a3．帧格式a. synchronization wordb. frame formatc. reverse operation答案：b4．噪声功率a. noisy environmentb. signal levelsc. noise power答案：c5．含噪声的环境a. signal levelsb. noisy environmentc. noise power答案：b6．模拟信号a. speech channelb. analog signalc. amplitude value答案：b7．脉冲流a. stream of pulsesb. receiving terminalc. terrestrial system答案：a8．传输路由a. transmission pathb. transmission qualityc. binary transmission答案：a9．互联网a. network resourceb. Internetc. interconnected systems答案：b10．命令a. copyb. hostc. command答案：c11．拷贝a. addressb. mousec. copy答案：c12．搜索工具a. user interfaceb. searching toolsc. electronic mail答案：b13．存取a. accessb. protocolc. copy答案：a14．网络资源a.textual messagesb. remote terminalsc. network resources答案：c15．文本信息a. information servicesb. hypertext protocolc. textual messages答案：c16．频谱a. bandwidthb. spread spectrumc. frequency band答案：b17．移动手机a. mobile subscriberb. mobile unitc. service performance答案：b18．频带a. frequency spectrumb. frequency bandc. spread spectrum 答案：b19．蜂窝交换机a. cellular switchb. cellular sitec. mobile unit答案：a20．单边带a. single-sidebandb. bandwidthc. service area答案：a21．服务区a. service areab. service performancec. service capability 答案：a22．移动用户a. mobile unitb. mobile subscriberc. mobile transceiver答案：b23．微处理器a. subsystemsb. utilizationc. microprocessor答案：c24．无线机架a. radio cabinetb. antennac. mobile unit答案：a25．电路交换a. packet switchingb. circuit switchingc. message switching 答案：b26．分组交换a. packet switchingb. circuit switchingc. message switching 答案：a27．报文交换a. packet switchingb. circuit switchingc. message switching 答案：c28．专用电路a. dedicated circuitb. error controlc. return signal答案：a29．突发性a. burstyb. randomc. header答案：a30．传输时延a. destination addressb. transmission delayc. return signal 答案：b31．中间交换设备a. given maximumb. intermediate switching equipmentc. store-and-forward manner答案：b32．子网a. headerb. subnetc. busty答案：b33. 公众电信网a.public telecommunication networkb. intermediate switching nodec. circuit- switched network答案：a34.半双工的a. full-duplexb. half-duplexc. external call答案：b35. 端局a. toll centerb. end officec. tandem switch答案：b36. 外部呼叫a. external callb. data trafficc. toll center答案：a37.链路a. trunkb. linkc. route答案：b38.交换节点a. intermediate switching nodeb. voice-frequency circuitc. switching node答案：c39.音频电路a. telephone subscriberb. voice-frequency circuitc. two wire connection答案：b40.拓扑a. internodesb. topologyc. route答案：b41.二线连接a. data trafficb. end officec. two wire connection答案：c42.数据流量a. data trafficb. tandem switchc. toll center答案：a43.全球通信a. interface equipmentb. global communicationc. communication carriers答案：b44.脉码调制a. pulse code modulationb. voice encodingc. open network 答案：a45.接口设备a. switching equipmentb. transmission mediumc. interface equipment答案：c46.综合业务数字网a)end-to-end digital connectivityb. international organization for standardizationc. integrated services digital network答案：c47.通信载体a. communication carriersb. transmission mediumc. interface equipment答案：a48.系统结构a. infrastructure c. flexibility d. basic access答案：a49.蜂窝式移动电话a. cellular switchb. cellular mobile telephonec. cellular site答案：b50.数据传输a. data transmissionb. transmission errorc. error flag答案：a51.传号电平a. space levelb. logical levelc. mark level答案： c52.接收机的定时a. intersymbol spaceb. serial interfacec. receiver timing 答案：c53.明显的缺点a. transmission errorb. obvious disadvantagec. error flag答案：b54. 起始位a. start bitb. stop bitc. parity bit答案：a55.空号电平a. mark levelb. space levelc. the idle state答案：b56.控制比特a. binary datab. local clockc. control bit答案：c57.串行接口a. data streamb. CRT terminalc. serial interface答案：c58.发送器和接收器a. transmitter and receiverb. receiver timingc. duration of T seconds答案：a59.二进制数据a. binary datab. data streamc. data transmission答案：a60.高速电子开关a. the voice channelb. the repetition ratec. a high-speed switch答案：cII.根据所给英文选择合适的答案1．digital communicationa.全球通信b. 公共通信载体c.数字通信答案：c2．voice encoding techniquesa.语音编码技术b. 脉冲c. 脉冲编码调制答案：a3．basic access signaling ratea.大量的接口设备b. 基本接入信令速率c. 统一的接入答案：b4．the International Organization for Standardizationa.综合业务数字网b. ISDN的标准和系统结构c. 国际标准化组织答案：c5．end-to-end digital connectivitya. 基本接入信令速率b.端对端的数字连接c. 语音编码技术答案：b6．progressive application of digital technologya.由于传输媒体导致的质量下降b.4KHz 话路中所固有的带宽限制c.数字技术的逐步应用答案：c7．enhanced qualitya.高质量b. 带宽的限制c.统一的接入答案：a8．the branches between nodesa.节点间的支路b. 中间交换节点c. 全双工的连接答案：a9．tree topologya. 双绞线b. 结构部件c. 树状拓扑答案：c10．backbone hierarchical networka. 国家网络b. 被分离开的子网c. 主干体系网络答案：c11．the subscriber that transmit digital signala. 发送数字信号的用户b. 一小部分用户c. 相邻的端局答案：a12．multiple voice-frequency circuitsa. 高效中继线b. 多音频电路c. 同步时分复用答案：b13．the function of concentrating traffica.集中话务量的功能b. 路由选择的基本次序c. 发送数字信号的用户答案：a14．full duplexa. 全双工的连接b. 全连通性c. 全双工的答案：c15．transmission facilitiesa. 传输设备b. 交换区c. 高效中继线答案：a16．switching techniquea.交换技术b. 电路交换c. 分组交换答案：a17．message switchinga.交换技术b. 报文交换c. 分组交换答案：b18．communication partiesa.传输单元b. 通信各方c. 返回信号答案：b19．the special signaling messagea. 存储转发传输技术b. 带宽的动态分配c. 特定的信令信息答案：c20．low channel utilizationa. 低的电路利用率b. 报文整个的传输时延c. 传输单元答案：a21．total path of connected linesa. 连线的整个通路b. 源到目的地的一对c. 带宽的动态分配22．radio cabineta. 无线通信行业b. 无线机架c. 多径衰耗答案：b23．telephone company zone officesa.移动收发信机b. 电话公司地方局c. 中央协调单元答案：b24．available radio frequency spectruma. 所分配的频带b. 调频广播业务c. 可用的无线电频谱答案：c25．central coordinating elementa. 中央协调单元b. 试验性的蜂窝系统c. 有限的服务能力答案：a26．severe spectrum limitationsa.严厉的频谱限制b. 有限的服务能力c. 有限的指定频带答案：a27．developmental cellular systema. 频谱利用率b. 试验性的蜂窝系统c. 传统移动电路的运行限制答案：b28．propagation path lossa. 调频广播业务b. 传输路径衰耗c. 无线机架答案：b29．backbone systema.主干系统b. 电子会议c. 远程终端答案：a30．live conversationa.最大的信息库b. 文本信息c. 实时的对话答案：c31．textual messagesa.搜索工具b. 万维网c. 文本信息答案：c32．the networked hypertext protocola.联网的超文本协议b. 网络设备资源c. 全国范围的网络答案：a33．the Unix operating systema. 主干系统b. 万维网c. Unix 操作系统答案：c34．the vast majority of the computers on the neta.在网上的绝大多数计算机b. 分布在全世界的计算机的巨大网络c. 全国范围的网络答案：a35．remote terminala. 电子会议b. 远程终端c. 文本信息36．the largest repository of informationa. 最大的信息库b. 实时的对话c. 方便的搜索工具答案：a37．the time division multiplexera. 时分多路复用b. 高速的电子开关c. 时分多路复用器答案：c38．A high-speed electronic switcha. 高速的电子开关b. 被传信号的波形c. 时分多路复用答案：a39．time Division Multiplexinga. 时分多路复用b. 时分多路复用器c. 地面系统答案：a40．the presence or absence of the pulsea. 一串幅值b. 每样值8 位码c. 脉冲的“有”或“无”答案：c41．the unique or absence of the pulsea. 脉冲的“有”或“无”b. 被称为同步字的独特的码序列c. 将抽样的幅值转换成一串脉冲的单元答案：b42．A sequence relating to channel1, 2 and so ona.涉及到第一路、第二路及其他各路的序列b.一条特定消息中的全部信号c.理论上的最小采样频率答案：a43．the schemes for performing these three functionsa. 电话质量的话路b. 由卫星上收到的信号c. 实现这三项功能的方案答案：c44．a series of amplitude valuesa.一串幅值b. 被传信号的波形c. 每样值8位码答案：a45．A speech channel of telephone qualitya. 实现这三项功能的方案b. 将抽样的幅值转换成一串脉冲的单元c. 电话质量的话路答案：c46．A sequence of 8-binary digitsa. 每样值8位码b. 一个8位二进制序列c. 一串幅值答案：b47．A minimum theoretical sampling frequencya. 理论上的最小采样频率b. 抽样量化和编码c. 将抽样的幅值转换成一组脉冲的单元答案：a48．the sparking of a car ignition systema. 高速电子开关b. 理论上的最小采样频率c. 汽车点火系统的打火答案：c49．the stream of the pulses with a repetition rate of 64KHz a. 真实信号与噪声信号的关系 b. 由传输路由引入的衰减c. 重复率为64KHz的脉冲流答案:c50．the relationship of the true signal to the noise signala. 真实信号与噪声信号的关系b. 脉冲的有和无c. 被称为同步字的独特的码序列答案：a51．terrestrial systema. 高速电子开关b. 地面系统c. 时分多路复用答案：b52．asynchronous serial data transmissiona. 数据链路面向字符的特征b. 异步串行数据传输c. 异步串行接口答案：b53．isolated subnetworksa. 被分离的子网b. 高效中继线c. 交换区答案：a54．two subscribers attached to different end officesa. 在站和网络之间的接口b. 路由选择的基本次序c. 连到不同端局的两个用户答案：c55．synchronous TDMa. 同步时分复用b. 多条音频电路c. 节点间的之路答案：a56．the clocks at the transmitter and receivera. 符号间空格持续时间的三倍b. 在字符后所收到的奇偶校验位c. 发送器和接收器时钟答案：c57．the transmitted dataa. 电传机时代b. 一个字符的点和划c. 所发送的数据答案：c58．the falling edge of the start bita. 起始位的下降沿b. 停止位的下降沿c. 电传机时代答案：a59．the group of bits called charactersa. 数据链路面向字符的特征b. 在字符后所收到的奇偶校验位c. 被称为字符的比特组答案：c60．A clock generated locally by the receivera. 最为流行的串行接口b. 由接收机本地产生的时钟c. 发送器和接收器的时钟答案：bIII.选择合适的答案1.Furthermore, we shall prove that a minimum theoretical sampling frequency of order 6.8KHz is required ( ) a voice channel ( ) the range 300 Hz to 3.4KHz.a. convey , occupyb. to convey, occupyingc. conveying , occupiedd. convey, to occupy答案：b2. For example, the signal ( ) from a satellite, ( ) in far outer space, is very weak.ａ. received, located b. receive, locate c. receiving, locatingd. to receive, to located答案：a3. If we consider binary transmission, the complete information about a particular message will always () by simply ( ) the presence or absence of the pulse.ａ.obtain, detect b. be obtained, detecting c. obtained, detectedd. obtaining, detected答案：ｂ4. There is a inherent advantage for ( ) noisy environments by ( ) digital transmission.ａ．overcoming, choose b. overcome, choosing c. overcome, choosed. overcoming , choosing答案：d5. Each voice channel has a separate coder, the unit ( ) converts sampled amplitude values to a set of pulse; and decoder, the unit ( ) performs the reverse operation.ａ．who, who b. when, when c. where, where d. that , that答案：d6. The problem is easily overcome by ( ) a frame format, where at the start of each frame a unique sequence of pulses is placed ( ) the start of the frame.a.specify, identifyb. specifying, so as to identifyc. specified, identifiedd. specify, identifying答案：b7. It was ( ) in 1969, when the U.S. Department of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to connect答案：b8. If somebody else had something interesting ( ) on their computer, it was a simple matter ( ) a copy.a.stored, to obtainb. to store, obtainedc. storing, obtainingd. store, obtain9. The Internet is a huge ( ) systems, but it users just a handful of method ( ) data around.a.interconnect, moveb. interconnected, to movec. to interconnect, movedd. interconnecting, moving答案：b10. The most commonly ( ) is electronic mail (E-mail) , or simply as mail, Mail permits network users ( ) textual messages to each other.e, sendb. to use, sentc. used, to sendd. using , sending答案：c11. Today thousands of network s and millions of computers ( ) the Internet.a.are connected tob. connected toc. to connectd. connecting to答案：a12. The simplest way ( ) a file on another host is to copy it across the network to your local host, FTP can do this.a.accessb. to accessc. accessedd. success答案：b13.One of many reasons for ( ) a cellular mobile telephone system and ( ) it in many cities is the conventional mobile telephone system.a.develop, deployb. to develop, to deployc. developing, deployingd. developed, deployed答案：c14. The ideal mobile telephone system would operate within a ( ) signed frequency band and would serve an almost ( ) number of users in ( ) areas.a.limited, unlimited, unlimitedb.limitation, limitation, limitationc.limit, limit, limitd. limiting, limiting, limiting答案：a15. LSI technology and mass production contribute to reduced cost ( ) in the future an average-income family should be able ( ) a mobile telephone unit.a.Which, affordingb. that, affordedc. when, affordd. so that, to afford答案：D16. Microprocessors and minicomputers are now ( ) for controlling many complicated features and functions with less power and size ( ) was previously possible.a. used, thanb. use, thisc. using, theyd. usage, it答案：a17. On Jan.4,1979, the FCC ( ) Illinois Bell Telephone Co. ( ) a developmental cellular system in the Chicago area and make a limited offering of its cellular service to the public.a. authorize, conductb. authorizing, conductingc. authorized, to conductd. to authorize, conducted18. Why 800 MHz? The FCC’s decision ( ) 800 MHz was ( ) because of severe spectrum limitations at lower frequency band.a.to choose, madeb. choose, to makec. choice, maked. choice, making答案：a19. The switch, ( ) circuit switches, have no capability of ( ) user’s data on their way to the destination.a. calling, storedb. called, storingc. to call, to stored. be called, be stored答案：b20. The circuit is set up by a special signaling message ( ) finds its way through the network, ( ) channels in the path as it proceeds.a. that, seizingb. where, seizingc. who, seizedd. one, be seized答案：a21. -The switching element is a computer ( ) a message processor, with processing and storage capabilities. Message travels independently and asynchronously, ( ) their own way from source to destination.a. to call , findb. calling, foundc. referred to as, findingd. be called, sending答案：c22. A variation of message switching is packet switching. Here the message is broken up into several pieces of a ( ) maximum length, ( ) packets.a. given, calledb. give, callc. giving, callingd. to give, to call答案：a23. The telephone contains a transmitter and receiver for ( ) back and forth ( ) analog voice and analog electrical signals.a. convert, inb. converting, betweenc. conversion, tod. converted, into答案：b24. Each subscriber connects ( ) local loop to a switching center, ( ) as an end office.a. to, callingb. with, knownc. the , knowd. via, known答案：d25. The trunks are designed ( ) multiple voice-frequency circuits ( ) either FDM or synchronous TDM.a. carry, useb. carried, usedc. to carry, to used. to carry, using答案：d26. Although originally to service analog telephone subscribers, the telephone network handles substantial data traffic ( ) modem, and gradually beingconverted to a digital network.a. implemented, viab. implementing, inc. to implement, withind. design, on答案：a27. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers or nodes.a. organization, consistb. organize, consistingc. to organize, consisting ofd. organizing , to consist答案：c28. ISDN’s enormous importance is only gradually being ( ) . Years of work have been ( ) by the CCITT and the ISO.a. understand, carryb. understanded, carriedc. to be understood, to carryd. understood, carried out答案：d29. The term ISDN was first defined within the CCITT in 1972. It referred to a network ( ) end-to-end digital connectivity ( ) a range of services.a. providing, forb. provision, toc. provided, withd. provide, into答案：a30. Similarly, the introduction of voice encoding techniques ( ) pulse code modulation contributed ( ) the ISDN’s concept evolution.a. usage, onb. using, toc. use, withd. used, so as to答案：b31. The enhanced quality is achieved when a signal is digitally encoded ( ) degradation ( ) the transmission medium.a. overcome, tob. overcame, withc. overcoming, overd. to overcome, due to答案：d32. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：d33. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：a34. If we consider binary transmission, the complete information about a particular message will always ( ) by simply ( ) the presence or absence of the pulse.a. obtain, detectb. be obtained, detectingc. obtained, detectedd. obtaining, detected答案：b35. An asynchronous serial data link is said ( ) character oriented, as information is transmitted in the form of group of bits ( )characters.a. be, callingb. to being, to callc. been, calld. to be, called答案：d36. It was ( ) in 1969, when the U.S Department of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to define答案：b37. Thus was born a new, but perpetually ( ) paging services ( ) at a one-way selective signaling system without speech.a. developing, consistingb. organize, consist ofc. develop, defined. to develop, to define答案：a38. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers.a. organizing, consistingb. organize, consist ofc. to organize, consisting ofd. to organize, to consist of答案：cIV.根据课文内容选择正确答案1.The integrated services digital network is the road map to the future for ( ).A.all forms of data communicationsB.all forms of digital communicationsC.all voice conversationsD.all personal communications答案：B2. The digital service offered the public carriers three very appealing characteristics: ( ) , economy, and flexibility.A. social abilityB. great capacityC. high speedD. enhanced quality答案：D3. As regards economy, early studies suggested that digital services offered significant advantages since the substantial quantity of interface equipment in the telephone exchange ( ).A. could be eliminatedB. could be usedC. could be decreasedD. could be widely used答案：A4. Today two 64 kbit/s, or 2B-channels coupled with a basic access signaling rate of 16 kbit/s, the D-channel, constitute ( ).A.the information superhighwayB.the local area networkC.the essential ISDN transmission rateD.the synchronous digital hierarchy答案：C5. Currently PSTN offers universal voice access to almost 750 million telephone around the world. ISDN is the network which will provide a similar universal access for ( ).A.voice service as wellB.not only voice but data, video, text, and other services as wellC.any analog information including voiceD.high speed data service答案：B6. The public telecommunications network can be described ( ).ing twisted pair of wiresing many thousands of subscribersing four generic architectural componentsing switching nodes答案：C7. The local loop is a pair of wires, generally twisted pair, that ( ).A.connects a subscriber to one of the nodes in the networkB.connects trunk in the networkC.attaches to the toll centerD.attaches to the primary center答案：A8. If the two subscribers are under the aegis of different regional centers, the circuit ( ).A.will involve a digital data systemB.will involve a trunk between regional centersC.will involve a PBX facilityD.will involve many end offices答案：B9. Each subscriber c9onnects via local loop to a switching center, known as ( ).A. a regional centerB. a tandem switchC. an end officeD. a telephone network答案：C10. There are over 19,000 end offices in the United States, so it is clearly impractical ( ).A.for each end office to have a direct link to each other end officeB.for the US to build so many switching centersC.for each end office to provide video serviceD.for each end office to support many thousands of subscribers答案：A11. With the introduction of digital data system, some subscribers that ( ) have been incorporated into the network.A.can provide video serviceB.transmit broadband programC.contain a transmitter and receiverD.transmit digital signals答案：D12. ( ) , a total path of connected lines is set up from the origin to the destination at the time the call is made, and the path remains allocated to the source-destination pair until it is released by the communication parties.A. In message switchingB. In packet switchingC. In circuit switchingD. In digital switching答案：C13. In message switching, the transmission unit is a well defined block of data called a message. In addition to the text to be transmitted, a message comprises ( ).A. a start and end of dataB. a header and checksumC. a start and a stop bitD. a transmitter and receiver答案：B14. A variation of message switching is packet switching. Here the message is broken up into several pieces of a given maximum length, ( ).A. called informationB. called textsC. called packetsD. called messages答案：C15. The header of a message contains information regarding ( ); the checksum is used for error control purposes.A. the text to be transmittedB. the source and destination addressesC. the voice channelsD. many packets between two computers答案：B16. With circuit switching, there is always an initial connection cost incurred in setting up the circuit. It is cost-effective only in those situations where once the circuit is set up ( ).A.the voice conversation beginsB.there is no any intervention on the part of the subnetC.there is a message to be transmittedD.there is a guaranteed steady flow of information transfer答案：D17. A major problem facing the radio communication industry is the limitation of ( ).A.the LSI technologyB.the poor service performanceC.the available radio frequency spectrumD.the size of the mobile transceivers答案：C18. Large-Scale Integrated circuit technology reduced ( ) so that they easily fit into the standard automobile.A.the costs of the transceiversB.the size of mobile transceiversC.the number of the channelsD.the frequency band of the transceiver答案：B19. A basic cellular system consists of three parts: a mobile unit, ( ).A.a cell site, and a mobile telephone switching officeB.a cellular processor and a cellular switchC.a control unit and a power plantD.an antenna and a data terminal答案：A20. Each mobile unit can only use one channel at a time for its communication link, ( ).A.the channel is fixed when the call is madeB.but the channel is not fixedC.and the channel is a high-speed data linkD.and many mobile units use the same channel答案：B21. The cellular switch, which can be either analog or digital, switches calls ( ).A.to connect mobile subscribers to the nationwide telephone networkB.to connect fixed telephone subscribers to one anotherC.to link together many fixed telephone usersing the microwave radio links答案：A22. People on the ARPNET quickly discovered that they could ( ) .municate to one another by telephoneB.exchange messages and conduct electronic “conferences” with distantC.conduct data communicationsD.get all kinds of information services, such as science, education答案：B23. Today thousands of network and millions of computers are connected to the Internet. It is growing so quickly ( ) how many users “On the Net”.A. that anybody knowsB. that you can tell usC. that anyone can say exactlyD. that nobody can say exactly答案：D24. The Internet is an international collection of computer networks that ( ), connected together through backbone systems.A.all understand a standard system of addresses and commandsB.all have the bridges and gatewaysC.all use the same addresses and the serversD.all understand importance of communications答案：A25. The Internet is the largest repository of information which can provide very very large network resources. The network resources can be divided into ( ).munication resources and computer resourcesB.servers resources and bridges resourcesC.facilities resources and information resourcesD.hardware resources and software resources答案：C26. As more and more systems join the Internet, and as more and more forms of information can be converted to digital form , ( ).A.the amount of stuff available to Internet users continues to growB.the Internet becomes very busyC.the number of Internet users becomes very largeD.the information in Internet is shared by more people.答案：A27. Before you can use the Internet, you must ( ).A.understand the regulations of the InternetB.choose a way to move data between the Internet and your PCC.install a serverD.study the concept of the communications答案：B28. ( ) is a networked hypertext protocol and user interface.A. Asynchronous serial interfaceB. E-mailC. InternetD. World wide web答案：D29. If the signal is very large compared to the noise level, then ( ).A.the signal-to-noise ratio is poorB.a perfect message can take placeC.it’s a terrestrial systemD.the noise power is very strong答案：B30. If we consider binary transmission, the complete information about a particular message will always be obtained ( ).A.by detecting the shape of the transmitted signalB.by detecting the level of the transmitted signalC.by calculating the parameters of the transmitted signalD.by detecting the presence or absence of the pulse答案：D31. At the receive terminal ( ) to separate the 8-digit sequences into the appropriate channels.A. PCM is usedB. a demultiplexer is neededC. the frame code is arrangedD. the coder is required答案：B32. It is ( ) which is of the most interest to the communication engineer.A.the method for overcoming noisy environmentsB.the relationship of the true signal to the noise signalC.the binary transmissionD.the quality of the transmission。