华南理工大学2018年《505素描》考研专业课真题试卷
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8288华南理工大学 6.在纯电感负载作星形连接的三相对称电路中,电源线电压为380V,各相电感的J惑2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一向交回)科目名称:电气工程综合适用专业F电机与电器:、电力系统及其自动化:高电压与绝缘技术:电力电子与电力传动;电工理论与新技术共5页一、填空题〈每题5 分,共60分〉抗XL=22Q,则三相负载的无功功率大小为()。
7. 图5 所示电路中,己知u( t )= (100 + 80v'2-cos(mt + 30°) + 18y2cos(3mt)] V , R=6kQ,(J)L=2kQ,土=18kQ,则电压表的读数为(〉。
CtJC2 kQl.图l所示电路的输入电阻为(〉。
R L2 A Jc图l 图22.图2所示电路中,元件A吸收的功率为〈)。
3. 图3 所示电路原已稳定,在t = O 瞬间将开关S 闭合,则i( OJ = C+2 {li(t) E 也I H2 0图3图44.图4所示电路中,己知U8 = 2L0°V ,R =X l = Xe=l Q,则电压表的读数为l5.有一交流信号源,电动势E=120V,内阻Ro=800Q,通过理想变压器给I 值为8 Q 的电阻供电,则此电阻可获得的最大功率为(第 1 页图5 图68.图6所示电路中,运算放大器为理想运放,则电流i=()。
9.一般来说,同步电机的运行状态包括(①)、(②〉和(@);汽轮发电机常采用(④〉结构,而低速、大容量的水轮发电机常采用(@)j 结构。
10.谐波的定义为(①〉,电流谐波总畸变率THDi的定义为(@)。
单相桥式全控整流电路、三相桥式全控整流电路和移相30°串联2重联结电路输入电涮的最低谐波次数分别为(@)、(④〉和(⑤)。
11.在各种负荷曲线中,日负荷曲线常用于(①)和(②),年最大负同曲线常用于〈@)和l(④),年持续负荷曲线中最大负荷利用小时数的定义为(@〉。
826华南理工大学2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)科目名称:工程热力学适用专业:工程热物理;动力机械及工程;动力工程(专硕)共页一、概念辨析(每题7 分,共42 分)1、状态参数与过程量;2、平衡状态与稳定状态;3、技术功与体积(变化)功;4、理想气体与实际气体;5、压缩因子与临界压力比;6、压气机的等温效率与绝热效率二、综合题(每题10 分,共40 分)1、理想气体的多变过程是如何定义的?请在同一p-v 图和同一T-s 图上分别画出理想气体的四个典型过程(定容、定压、定温和定熵),并把满足以下要求的理想气体多变过程在这两个图上分别对应表示出其大致位置,同时给出每个过程的多变指数范围。
1)工质升温且降压;2)工质压缩且降压;3)工质升温且放热。
2、若某压气机的压缩过程可视为绝热的,请利用T-s 图分析过程的不可逆性对压气机性能的影响,并示意性画出其不可逆性导致的做功能力的损失。
设环境温度为T0 。
3、请在T-s 图上表示内燃机的理想混合加热循环,并导出其热效率计算公式(要求公式中的变量均为无量纲比参数),设工质是比热为定值的理想气体。
4、若环境空气处于某一未饱和湿空气状态A,其对应结露时状态和饱和状态分别为B 和C,请在p-v 图和T-s 图上定性地对应表示出这三个状态点,并说明什么是露点。
a ⎫ 2 1 三、证明题(12 分) 已知范德瓦尔气体状态方程式为:⎛ p + 2 ⎪(v - b ) = R g T ,试证明对于这种气体有 du = c v dT + a dv 。
⎝v ⎭ v四、简算题(每题 9 分,共 27 分)1、某柴油机用压缩空气启动,压缩空气装在容积为V = 0.04m 3的气罐内,柴油机启动前后,气罐上的压力表读数分别为 p e 1 = 10.5MPa 和 p e 2 = 0.5MPa 。
启动前后 罐内空气的温度与环境接近,均可设为 t = 27℃,其气体常数为 R g = 287J / (kg .K ) , 绝热指数 k = 1.4 ,请估算启动过程的耗气量。
870华南理工大学2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)科目名称:英语语言文学综合适用专业:外国语言文学共 6 页Part OneFundamentals of Linguistics and Literature (外国语言学及应用语言学和英语语言文学考生共答部分)I.Define the following terms in your own words(20 points)1.Turn-taking2.Validity3.Modernism4.IronyII.Answer the following questions(40 points)1.The Australian linguist Halliday considers language as having three main functions.Please specify these three functions.2.What are homophones? Please give two pairs of examples.3.What is narration? Can you support your answer with examples?4.What is stream of consciousness? Please explain it with an example from a literarytext you’ve read.Part TwoTest for Students of Linguistics and Applied Linguistics(外国语言学及应用语言学考生必答部分)I.Discuss and comment on the following topics(40 points)petence and performance2.Error and mistake3.The relationship between pragmatics and semantics4.In Hymes’ view, learning language is learning to perform certain functions.II.Analyze the language data according to the requirements(50 points)1.Read the following two passages, and analyze the varieties of language use and thedifferent perspectives on language in an essay of about 250 words. Please back up your idea with the related linguistic theories. (25 points)Passage A:A living language is continually changing, even in a small community. Usually, linguistic changes take place so slowly that it is only by looking back over at least several decades that one can detect changes. The most obvious changes in the language of a large, sophisticated community occur in the field of vocabulary, for in such a community new words are constantly being created and old words discarded.(D. Ward, The Russian Language Today)Passage B:Hampshire: Am I right in thinking − you must correct me if I’m wrong − that your studies of language have led you to the conclusion that there are certain …common … underlying structures common to all languages which constitute something like a universal grammar?Chomsky: Yes. It seems to me that the evidence available to us suggests that there must be some very deep … inborn principles, probably of a highly restrictive nature that determine how knowledge of a language emerges in an individual given the very scattered and degenerate data available to him.Hampshire: Your evidence is derived really from learning, the study of learning language?Chomsky: It seems to me that if you want to study learning in a serious way, what one really has to do is to study a sort of input-output situation. We have an organism of which we know nothing; we know what kind of data is available to it; we can discover that; and the first question we must then try to answer is: what kind of a mental structure does the organism develop when that evidence is presented to it?2.Read and compare the following two passages, and analyze the linguistic structuresand styles in an essay of about 250 words. (25 points)Passage C:We, the peoples of the U. N., determined to save succeeding generations from the scourge of war, which twice in our lifetime has brought untold suffering to mankind, and to reaffirm faith in fundamental rights, in the dignity and worth of the humanperson, in the equal rights of men and women and of nations large and small, and to establish conditions under which justice and respect for the obligations arising from treaties and other sources of international law can be maintained, and to promote social progress and better standards of life in larger freedom, and for these ends, to practice tolerance and live together in peace with one another as good neighbors, and to unite our strength to maintain international peace and security, and to ensure, by the acceptance of principles and the institution of methods, that armed force shall not be used, save in the common interest, and to employ international machinery for the promotion of economic and social advancement of all peoples, have resolved to combine our efforts to accomplish these aims.(The Charter of the United Nations)Passage D:He stepped into the stream. It was a shock. His trousers clung tight to his legs. His shoes felt the gravel. The water was a rising cold shock.…His mouth dry, his heart down, Nick reeled in. He had never seen so big a trout. There was a heaviness, a power not to be held, and then the bulk of him, as he jumped. He looked as broad as a salmon.Nick’s hand was shaky. He reeled in slowly. The thrill had been too much. He felt, vaguely, a little sick, as though it would be better to sit down.(Ernest Hemingway, Big Two-Hearted River)Part ThreeTest for Students of English Language and Literature(英语语言文学考生必答部分)I.Discuss and comment on the following topics(40 points)ment on Hemingway (Code) Heroes.ment on Oedipal Complex in literature.ment on the importance of interior monologue in any literary text written by afemale writer.ment on realism and its significance in literary history.II.Analysis and appreciation(50 points)1.Analyze the following passage from Moby Dick (1851), written by Herman Melville (1819-1891), in an essay of no less than 250 words. (25 points)Now, when I say that I am in the habit of going to sea whenever I begin to grow hazy about the eyes, and begin to be over conscious of my lungs, I do not mean to have it inferred that I ever go to sea as a passenger. For to go as a passenger you must need to have a purse, and a purse is but a rag unless you have something in it. Besides, passengers get sea-sick- grow quarrelsome- don't sleep of nights- do not enjoy themselves much, as a general thing;- no, I never go as a passenger; nor, though I am something of a salt, do I ever go to sea as a Commodore, or a Captain, or a Cook. I abandon the glory and distinction of such offices to those who like them. For my part, I abominate all honorable respectable toils, trials, and tribulations of every kind whatsoever. It is quite as much as I can do to take care of myself, without taking care of ships, barques, brigs, schooners, and what not. And as for going as cook,- though I confess there is considerable glory in that, a cook being a sort of officer on ship-board- yet, somehow, I never fancied broiling fowls;- though once broiled, judiciously buttered, and judgmatically salted and peppered, there is no one who will speak more respectfully, not to say reverentially, of a broiled fowl than I will. It is out of the idolatrous dotings of the old Egyptians upon broiled ibis and roasted river horse, that you see the mummies of those creatures in their huge bake-houses the pyramids.No, when I go to sea, I go as a simple sailor, right before the mast, plumb down into the fore-castle, aloft there to the royal mast-head. True, they rather order me about some, and make me jump from spar to spar, like a grasshopper in a May meadow. And at first, this sort of thing is unpleasant enough. It touches one's sense of honor, particularly if you come of an old established family in the land, the Van Rensselaers, or Randolphs, or Hardicanutes. And more than all, if just previous to putting your hand into the tar-pot, you have been lording it as a country schoolmaster, making the tallest boys stand in awe of you. The transition is a keen one, I assure you, from a schoolmaster to a sailor, and requires a strong decoction of Seneca and the Stoics to enable you to grin and bear it. But even this wears off in time.What of it, if some old hunks of a sea-captain orders me to get a broom and sweep down the decks? What does that indignity amount to, weighed, I mean, in the scales of the New Testament? Do you think the archangel Gabriel thinks anything the less of me, because I promptly and respectfully obey that old hunks in that particular instance? Who ain't a slave? Tell me that. Well, then, however the old sea-captains may order me about- however they may thump and punch me about, I have the satisfaction ofknowing that it is all right; that everybody else is one way or other served in much the same way- either in a physical or metaphysical point of view, that is; and so the universal thump is passed round, and all hands should rub each other's shoulder-blades, and be content.Again, I always go to sea as a sailor, because they make a point of paying me for my trouble, whereas they never pay passengers a single penny that I ever heard of. On the contrary, passengers themselves must pay. And there is all the difference in the world between paying and being paid. The act of paying is perhaps the most uncomfortable infliction that the two orchard thieves entailed upon us. But being paid, - what will compare with it? The urbane activity with which a man receives money is really marvelous, considering that we so earnestly believe money to be the root of all earthly ills, and that on no account can a monied man enter heaven. Ah! how cheerfully we consign ourselves to perdition!Finally, I always go to sea as a sailor, because of the wholesome exercise and pure air of the fore-castle deck. For as in this world, head winds are far more prevalent than winds from astern (that is, if you never violate the Pythagorean maxim), so for the most part the Commodore on the quarter-deck gets his atmosphere at second hand from the sailors on the forecastle. He thinks he breathes it first; but not so. In much the same way do the commonalty lead their leaders in many other things, at the same time that the leaders little suspect it. But wherefore it was that after having repeatedly smelt the sea as a merchant sailor, I should now take it into my head to go on a whaling voyage; this the invisible police officer of the Fates, who has the constant surveillance of me, and secretly dogs me, and influences me in some unaccountable way- he can better answer than anyone else. And, doubtless, my going on this whaling voyage, formed part of the grand programme of Providence that was drawn up a long time ago. It came in as a sort of brief interlude and solo between more extensive performances. I take it that this part of the bill must have run something like this:"Grand Contested Election for the Presidency of the United States."WHALING VOYAGE BY ONE ISHMAEL.""BLOODY BATTLE IN AFFGHANISTAN."Though I cannot tell why it was exactly that those stage managers, the Fates, put me down for this shabby part of a whaling voyage, when others were set down for magnificent parts in high tragedies, and short and easy parts in genteel comedies, and jolly parts in farces- though I cannot tell why this was exactly; yet, now that I recall all the circumstances, I think I can see a little into the springs and motives which being cunningly presented to me under various disguises, induced me to set about performing the part I did, besides cajoling me into the delusion that it was a choice resulting from my own unbiased freewill and discriminating judgment.Chief among these motives was the overwhelming idea of the great whale himself. Such a portentous and mysterious monster roused all my curiosity. Then the wild and distant seas where he rolled his island bulk; the undeliverable, nameless perils of the whale; these, with all the attending marvels of a thousand Patagonian sights and sounds, helped to sway me to my wish. With other men, perhaps, such things would not have been inducements; but as for me, I am tormented with an everlasting itch for things remote. I love to sail forbidden seas, and land on barbarous coasts. Not ignoring what is good, I am quick to perceive a horror, and could still be social with it- would they let me- since it is but well to be on friendly terms with all the inmates of the place one lodges in.By reason of these things, then, the whaling voyage was welcome; the great flood-gates of the wonder-world swung open, and in the wild conceits that swayed me to my purpose, two and two there floated into my inmost soul, endless processions of the whale, and, mid most of them all, one grand hooded phantom, like a snow hill in the air.2.Read the following Sonnet by William Shakespeare (1564-1616), and write an analytical essay in about 250 words. (25 points)Shall I compare thee to a summer's day?Thou art more lovely and more temperate:Rough winds do shake the darling buds of May,And Summer's lease hath all too short a date:Sometime too hot the eye of heaven shines,And often is his gold complexion dimm'd;And every fair from fair sometime declines,By chance, or nature's changing course, untrimm'd:But thy eternal summer shall not fadeNor lose possession of that fair thou owest;Nor shall death brag thou wander'st in his shadeWhen in eternal lines to time thou growest:So long as men can breathe or eyes can see,So long lives this and this gives life to thee.。
357华南理工大学2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)科目名称:英语翻译基础适用专业:英语笔译(专硕)共页I.Translate each of the following statements into Chinese (50):1.John saw the writing on the wall for the British car industry two decadesago.2.Without tools man is nothing, with tools, he is all.3.There is a mixture of the tiger and the ape in the character of Trump.4.Snow was treated very shabbily by the U.S. press and officialdom duringthis period, victimized for his views.5.Our journey has brought us halfway across northern China.6.I was, and remain, grateful for the part he played in my election.7.Rainbows are formed when sunlight passes through small drops of water inthe sky.8.Greenland is not a continent, as people thought.9.He was a bit of a dog in his younger days.10.It was another one of those Catch-22 situations, you’re damned if you doand you’re damned if you don’t.II.Translate each of the following statements into English (50):1. 我的脑海中为什么只有他的影子呢?2. 她性格内向、脾气不好,总是郁郁寡欢。
820华南理工大学2018年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)科目名称:高分子化学与物理适用专业:高分子化学与物理;材料科学与工程;材料工程(专硕)共页高分子化学部分一、单项选择题(共15题。
每题1分,共15分)1、以下已商品化的聚合物中,采用阳离子聚合机理合成的是()。
A、ABSB、乳聚丁苯橡胶C、高抗冲聚苯乙烯D、丁基橡胶2、以下聚合物中,由配位聚合制得、且不涉及立体异构的是()。
A、低密度聚乙烯B、高密度聚乙烯C、溶聚丁苯橡胶D、全同聚丙烯3、下列单体进行自由基聚合反应时,最难获得高分子链均聚物的单体是()。
A、四氟乙烯B、苯乙烯C、马来酸酐D、丙烯酸甲酯4、无定形态聚合物与小分子的化学反应中,控制反应速率的主要因素是()。
A、小分子在聚合物中的扩散速率B、小分子中官能团的反应活性C、聚合物中官能团的反应活性D、反应温度5、应用活性阴离子聚合制备苯乙烯、甲基丙烯酸甲酯、丙烯酸甲酯的三嵌段共聚物,正确的加料顺序是()。
A、甲基丙烯酸甲酯、丙烯酸甲酯、苯乙烯B、苯乙烯、甲基丙烯酸甲酯、丙烯酸甲酯C、丙烯酸甲酯、甲基丙烯酸甲酯、苯乙烯D、苯乙烯、丙烯酸甲酯、甲基丙烯酸甲酯6、某聚合体系的配方为:苯乙烯 50 g,水 250 g,过氧化苯甲酰 0.3 g,聚乙烯醇2g,碳酸钙 3g。
以下关于该聚合体系的描述,正确的是()。
A、该体系进行的是溶液聚合,PVA和碳酸钙起聚合活性剂作用B、该体系进行的是乳液聚合,PVA和碳酸钙起乳化作用C、该体系进行的是悬浮聚合,PVA和碳酸钙起分散作用D、该体系进行的是悬浮聚合,PVA和碳酸钙起乳化作用7、下列聚合物属于杂链聚合物的是()。
A、聚丙烯B、聚硅氧烷C、聚苯乙烯D、天然橡胶8、外加酸催化聚酯化反应的平均聚合度(X n)与时间(t)的关系为()。
A、X n与t 成线性关系B、X n与t1/2 成线性关系C、X n与t2 成线性关系D、(X n)2 与t成线性关系9、下列单体可以发生自由基聚合反应的是()。
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华南理工大学
2018年攻读硕士学位研究生入学考试试卷
(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)
科目名称:城市规划设计(做图)
适用专业:城乡规划学;城市规划(专硕)
华南理工大学
2017年攻读硕士学位研究生入学考试试卷
(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)
科目名称:城市规划设计(做图)
适用专业:城乡规划学;城市规划(专硕)
华南理工大学
2016年攻读硕士学位研究生入学考试试卷
(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)
科目名称:城市规划设计(做图)
适用专业:城乡规划学,城市规划(专业学位)。
880华南理工大学2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)科目名称:分析化学适用专业:分析化学共13 页一、单项选择题【1-20 题每题1 分,21-30 题每题2 分】1. 按照酸碱质子理论,Na2HPO4是()A.中性物质B.酸性物质C.碱性物质D.两性物质2. 下列有关随机误差的论述中不正确的是()A.随机误差是由一些不确定的偶然因素造成的B.随机误差出现正误差和负误差的机会均等C.随机误差在分析测定中是不可避免的D.随机误差具有单向性3. 用氧化锌标定EDTA 溶液时,下列操作会导致EDTA 浓度偏高的是()A.氧化锌未进行干燥B.滴定管洗净后,未用EDTA 溶液润洗C.滴定完成后,最终读数时,发现滴定管挂水珠D.最终读数时,终点颜色偏深4. 间接碘量法测定可溶性铜盐时,若放置一段时间后出现“回蓝”现象,则可能是由于()A.反应不完全B.空气中O2氧化I-C.氧化还原反应速度慢D.淀粉指示剂变质5. 摩尔法测定Cl-,控制溶液pH=4.0,其滴定终点将()A.不受影响B.提前到达C.推迟到达D.刚好等于化学计量点6. 用高锰酸钾法测定铁,一般使用硫酸而不是盐酸调节酸度,其主要原因是()A.盐酸有挥发性B.硫酸可以起催化作用C.盐酸强度不够D.Cl-可能与KMnO4 反应7. AgCl 在0.01mol/L HCl 中溶解度比在纯水中小,是()的结果。
A.共同离子效应B.酸效应C.盐效应D.配位效应8. 氧化还原反应的条件平衡常数与下列哪个因素无关()A.氧化剂与还原剂的初始浓度B.氧化剂与还原剂的副反应系数C.两个半反应电对的标准电位D.反应中两个电对的电子转移数9. pH 玻璃电极使用前必须在水中浸泡,其主要目的是()A.清洗电极B.活化电极C.校正电极D.清除吸附杂质10. 用氟离子选择性电极测定水中(含有微量的Fe3+、Al3+、Ca2+、Cl-)的氟离子时,应选用的离子强度调节缓冲溶液为()A.0.1 mol/L KNO3B.0.1 mol/L NaOHC.0.1 mol/L 柠檬酸钠(pH 调至5-6)D.0.1 mol/L NaAc(pH 调至5-6)11. 在正相色谱柱上分离含物质1,2,3 的混合物,其极性大小依次为:物质1>物质2>物质3,其保留时间t 的相对大小依次为()A.t1>t2>t3B.t1<t2<t3C.t2>t1>t3D.t2<t1<t312. 常用于评价色谱分离条件选择是否适宜的参数是()A.理论塔板数B.塔板高度C.分离度D.死时间13. 在符合朗伯-比尔定律的范围内,有色物质的浓度、最大吸收波长、吸光度三者的关系是()A.增加、增加、增加B.减小、不变、减小C.减小、增加、增加D.增加、不变、减小14. 下列仪器分析方法中适宜采用内标法定量的是()A. 紫外-可见分光光度法B. 原子吸收光谱法C. 色谱分析法D. 极谱分析法15. 用0.10 mol/L NaOH 滴定同浓度HAc(pKa=4.74)的pH 突跃范围为7.7~9.7。
-m2 V 1 .线温等为CG线 虚 中图’hu la-'P Lw h -G R 俨l i l --L rn Ef $4过Ch !-OL W ’r E’1程 判是Md 川热吸 口玉 咄L 还’过 体- 线热气 ,肉强 吸 阳山 l 姥 色 刷 拙J :i线 柑川 机川川执…M热勾 虚 两 这 断 · 队 放 但 吸 F F 吸 程中 惆 热程 程 放 叩2阳-1 .860华南理工大学2018 年攻读硕士学位研究生入学考试试卷( 试卷上做答无效 ,请在答题纸上做答 ,试后本卷必须与答题纸一同交回〉 。
d科目名称 :普通物理(含力 、热、电、光学) 适用专业 :理论物理:凝聚态物理 :声学:光学;材料科学与工程 :物理电子学 :共 f 页 。
;7' v材料工程(专硕)一、选择题 (共 48 分,每题 4 分〉l 、几个不同倾角的光滑斜面 ,有共同的底边 ,顶点也在同一坚直面上 .若使一物倒( 视为质点) 从斜面上端由静止滑到下端的时间最短 ,则斜面的倾角应选(A) 60。
. (B) 45° . (C) 30。
.(D) 15。
.[]2、某物体的运动规律为 d v / d t = -k v 勺 ,式中的 k 为大于零的常量 .当t = O 时,初速为 Vo ,则速度 U 与时间 t 的函数关系是(D) abc 过程和 def 过程都放热. []6、一定量的理想气体经历 二cb 过程时吸热500 J. 则经历 cbda 过程时 ,吸热为(A ) 马200 J. (B ) 一700 J.p (×105 Pa)(A) v=kt 2 叫(C) -400 J .(D) 700 J.。
V ( 10-3 m3)1 kt2 1(C) 一=--::-- +一’ , U 二L Vo3、一质量为 m 的质点,在半径为 R 的半球形容器中 ,由静止开始自边缘上的 A 点滑 下,到达最低点 B 时,它对容器的正压力为N. 则质点自 A℃!57[ ]47、一铜板厚度为 D= l .OO mm ,放罩在磁感强度为 B= 1.35 T 的匀强磁场中,磁场方|向垂直于导体的侧表面 ,如图所示 ,现测得铜板上下两面电势差为 V=1.10×10 5 v ,己B 知铜板中自 由电子数密度 n =4.20 ×102s m 3, 滑到 B 的过程中,摩擦力对其作的功为A(A) 护(N 训 电子电荷 e=l.60 ×10-19 c,则此铜板中的电 歹争叶阳一mg ) .(D)i R( N 切)[]8、如图所示 .一电荷为 q 的点电荷,以匀角速度ω作圆周 运动 ,圆周的半径为 R. 设 t = O 时 q 所在点的坐标为 xo = R , 4、如图,两木块质量为 m1 和 叫,由一轻弹簧连接,放在光滑水平桌面上 ,先使网木块靠近而将弹簧压紧 ,然后由静止释放 .若在弹簧伸长到原长时,m1 的速率为 V1,则弹簧原来在压缩状态时所具有的势能是o = O ,以T , ] 分别表示 x 轴和 y 轴上的单位矢景 ,则圆心处 点的位移电流密度为 :1 m1 + m2 2总 二点点达-2.口._L 二sm w t Iqw『x(i )(A) 一m 1V12(B) (A)(B)一一一τcos mt J2 m1 4 π R 24πRqw -qw-1 m1 + m2 z(C)一一k(D)一 丁(sin wti - c os mtj) (C)三(m1 + m2 ) V 1 .(D ) -m1V 1 . 4πR 22 m24πR第页第 2 页\Y i u )-E Er 饨A ~「, D G的一市民川r E F图nu 品UF 历经。
878
华南理工大学
2018 年攻读硕士学位研究生入学考试试卷(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回)
科目名称:生物化学与分子生物学适用专业:生物学;生物医学工程;生物医学工程(专硕)
共页
一、问答题
1、论述蛋白质一、二、三、四级结构特征及其与功能的关系。
(15 分)
2、论述非编码RNA 的种类及每种非编码RNA 的结构特点和功能(最少5 种)。
(15 分)
3、论述蛋白组学流程和核心技术及原理。
(10 分)
4、简述三羧酸循环的过程及意义。
(10 分)
5、何谓酶原,说说酶原激活的生理意义。
(10 分)
6、从DNA、RNA 和蛋白质水平论述基因表达的调控。
(15 分)
7、简述蛋白质分离纯化的方法及原理(最少3 种)。
(10 分)
8、简述乙酰辅酶A 羧化酶在脂肪代谢中的核心作用。
(10 分)
9、论述血糖异常可能的原因。
(15 分)
10、简述Illumina 二代高通量测序技术的原理和应用。
(10 分)
11、谈谈你对2017 年诺贝尔“生理医学奖”的研究成果“生物钟”的理解和意义。
(15 分)12、设计实验在大肠杆菌中表达一种异源蛋白,写出异源蛋白基因获取、表达和鉴定的流程与方法。
(15 分)
第 1 页。
第 2 页R21 1uR1,8188’?华南理工大学2018 年攻读硕士学位研究生入学考试试卷四、如图四所示电路,己知电源电流毛=10cosl04t A, R1 =乓=10Q , C = Sµ F ,求电压U ,并 写出U 的瞬时表达式。
(1 5 分〉(试卷上做答无效,请在答题纸上做答,试后本卷必须与答题纸一同交回) 科目名称:电路原理适用专业:电气工程(专硕)共 4 页十一、用叠加原理求图一所示电路中电压u 。
(1 5 分)sn10n+图四五、用回路电流法求解图五所示电路中电流I 。
ClS 分)图一二、电路如图二所示,试求输出电压Uo 与输入电压U1之间关系的表达式。
(15 分)Ru,200图五六、用结点电压法求解图六所示电路中电压U 。
(15 分)图二三、求图三所示电路在a 、b 端口的戴维宁和诺顿等效电路。
(15 分〉10n40sn++asov151b图六+136Vv ,、nu w+ 、页匪一l第+3V 201 I 0.5IL+Uc lH UL七、图七所示电路中,(;2 = 200L0°V,乓=6Q , XLI = 8Q,几=1飞=X L2 =Xe =lOQ,求(1)j,。
:(2)电路的功率因数λ:(3)电路的无功功率Q。
(15分)十、对称三相电路如图所示,相电压有效值为220V ,连接了一个对称三柏负载,负载线电流为l OA,功率因数为0.6 C 滞后),问:需并联无功功率为多少的对称容性负载才能使功率因数为1? ( 15 分)zAjXcr T图七BC;去京|zN'z|去八、图八所示电路在开关S打开前已稳定,t=O时S打开,求色0 时电压u(t)。
(15分)In s60图八九、图九所示电路中,己知Us =lOOV, R1 = l O Q,乓=乓=20Q ,开关S 闭合前电1 工J图十路处于稳态,t=O时开关S闭合,试求1i(0+)及乌(O+)。
C15分)十图九R1R2UsCi I第 3 页第 4 页。