训练一 “电路分析基础”试题(120分钟)—III 一、单项选择题（在每个小题的四个备选答案中，选出一个正确答案，并将正确答 案的号码填入提干的括号内。每小题2分，共40分） 1、图示电路中电流i等于（） 1）1A 2）2A 3）3A 4）4A 2、图示单口网络的短路电流sc i等于（）1）1A 2）1.5A 3）3A 4）-1A 3、图示电路中电压u等于（） 1）4V 2）-4V 3）6V 4）-6V 4、图示单口网络的开路电压oc u等于（）1）3V 2）4V 3）5V 4）9V 7AΩ 2Ω 1 Ω 4 i 6V Ω 2 Ω 4 sc i Ω 2 Ω 4 + _ Ω 2 Ω 2 - 2V + - 10V + u - + Ω 1Ω 2 6V + _ 3V + _ + - oc u
5、图示电路中电阻R 吸收的功率P 等于（ ） 1）3W 2）4W 3）9W 4）12W 6、图示电路中负载电阻 L R 吸收的最大功率等于（ ） 1）0W 2）6W 3）3W 4）12W 7、图示单口网络的等效电阻等于（ ） 1）2Ω 2）4Ω 3）6Ω 4）-2Ω 8、图示电路中开关断开时的电容电压)0(+c u 等于（ ） 1）2V 2）3V 3）4V 4）0V 3V Ω 2+_ R Ω 1A 3Ω 3+ _ 6V 5:1 L R Ω 4- + i 2a b 4V Ω 2+ _ Ω 2+ - c u +_ 2V =t F 1
9、图示电路开关闭合后的电压)(∞c u 等于（ ） 1）2V 2）4V 3）6V 4）8V 10、图示电路在开关断开后电路的时间常数等于（ ） 1）2S 2）3S 3）4S 4）7S 11、图示电路的开关闭合后，电感电流)(t i 等于（） 1）t e 25- A 2）t e 5.05- A 3）)1(52t e -- A 4） )1(55.0t e -- A 12、图示正弦电流电路中电压)(t u 的振幅等于（） 1）1V 2）4V 3）10V 4）20V Ω46V Ω 2+ _ Ω 2+ - c u 0=t F 1- +1u 1 2u + - Ω 2+ _ Ω2+ - =t F 1F 25A Ω 20=t i 1H s 10+ _ + _ u 1H s u F 25.0V t t u s )2cos()(=
Unit 1 TEXT A Language focus Word in use [3] 1.whereby 2. pursuit 3. inhibit 4. maintain 5. patriotic 6. transcend 7. endeavor 8. dedication 9. prestige 10. nominate Word building [4] [5] 1.resultant 2. tolerant 3. pollutants 4. inhabited 5. participants 6. descendants 7. attendants 8. respectful 9. contestants 10. neglectful 11. resourceful 12. boastful Banked cloze [6] 1.eventually 2. premier 3. endeavor 4. bypass 5. handicaps 6. committed 7. attained 8. transcend 9. feats 10. slightest Expressions in use [7] 1. removed from 2. failed in 3. in pursuit of 4. deviated from 5. precluded from 6. triumph over 7. work their way into 8. written off
TEXT B Understanding the text [2] CBADBBCD Language focus Word in use [4] 1.indulge 2. propelled 3.aggravated 4.dazzled 5. alleviated 6.renowned 7.eloquent 8. destined 9.scorns 10. Applause Expression in use [5] 1.up 2.in 3.on 4.up 5.to 6.on 7.as 8.out sentence structure [6] 1.He prefers to start early rather than leave everything to the last minute 2.She prefers to be the boss, to be in charge and to organize others rather than be organized by some whom she may not even rate very highly. 3.My brother prefers to take the whole blame himself rather than allow it to fall on the innocent. [7] 1. Try as he would 2. Search as they would 3. Hard as we work Try as we might Collocation Warm-up 1. repeated 2.overwhelming 3.immense 1.heroic 2.sound 3.substantial 1.attained 2.fueled 3.achieved [8] 1. sudden opportunities 2. immense obstacles 3. amazing determination 4. profound difficulties 5. overwhelming failures 6. poverty-stricken 7. substantial hardship 8. repeated misfortunes 9. sheer persistence 10. dazzle audiences 11. achieve fame 12. strong will
小学生语法专项练习题 名词练习 一.写出下列单数名词的复数形式 _______ 答案：1 oranges 2. Boxes 3. women 4. tomatoes 6. boys 7babies 9. Photos 10 classes 11. feet 12 houses 13 pens 14 cars 15 horses 16. radios 17 dishes 18 children 二.将下列单词的复数形式改成单数形式 ________ _________ 答案 1. doctor 2 city 3 piano 4. ear 5. church 6. leaf 7 tooth 8zoo 9brush 10 knife 12 pear 三.请从括号里选出正确的答案 1. Please give me__（two /two cups of ）coffee. 2. There are a lot of___(sheep /sheeps ) on the farm. 3. I’d like some__ (bread / breads ) and___ (potato /potatoes). 4. Look! There is a ___(mouse /mice) in the corner. 5. He bought_____(a piece of /a piece ) paper. 6. “Where is___ (Woman’s / Women’s) Room?” asked Susan. 7. ____ (The girl’s/The girls’ ) hobby is drawing. 8. Aunt Lucy sent_____ (a child’s /a children’s ) book to me. 红色为答案 冠词练习 一.在空格内填上a或an
韩山师范学院 2009 年专升本插班生考试试卷 英语 /英语（商贸英语）专业英语语法（ A 卷 ) 号一二三四五分卷人 得分 （请将答案写在答题纸上） I. Choose the correct answer( 40% ) Directions: Complete the following sentences with one of the four items which marked A,B,C and D and then write down the corresponding letter on the ANSWER SHEET. *1. She was burdened with ________. A. support family B. the family ’s support C. family support D. family ’s support 2. He was not ______ to admit his mistakes in public. A. man enough B. enough man C. a man enough D. enough a man 3. That guy was ______ than I thought. A. as much of a fool B. enough of a fool C. fool enough D. less of a fool 4. ______ work has to be done before the plant goes into operation. A. Much B. Double C. A number of D. Neither 5. The students spent ______ their time working in the field. A. both B. most C. more D. half 6. _______ cases have been reported. A. Such few B. Such some C. Few such D. Some these 7. He has been staying at home _______ days. A. these all last few B. these last few all C. all these last few D. these last all few *8. He has been _______ only once. A. by plane B. by the plane C. on plane D. on the plane *9. Do you like these computers? I don’tlike _______. A. all them B. them all C. everyone D. any 10. Plastics industry is being asked to develop materials for _______ of new uses. A. a so wide variety B. so a wide variety C. a such wide variety D. such a wide variety 11. Chang and Wang have arrived, but _______ students in your class aren’there yet. A. other B. others C. the other D. the others 12. He is _____ of an artist. A. anybody B. anyone C. somebody D. something 13. His sister always keeps herself ______. A. clearly B. clean C. clear D. cleanly 14. I’d rather you _______ with him. A. didn ’tinterfere B. don’tinterfere C. should not interfere D. would not interfere *15. One minute too late is _____ in time ______ half an hour. A. not more?than? B. as?as? C. no more?than? D. less?than?
新视野大学英语第三版课后答案 Unit 1 III 1 ben eath 2 disguised 3 whistles 4 restra in 5 grasp 6 longing 7 pray ing 8 faithful 9 pledge 10 drain IV 1 tell …on you 2 track down 3 work it out 4 picking on me 5 reckoned with 6 call on 7 on his own 8 get through 9 in disguise 10 revolves around V G O D I K L B F A N VI 1 advise 2 level 3 problems 4 n ecessity 5 skills 6 experie nee 7 solutio n 8 value 9 tool 10 manner VII 1 air-conditioned（装空调的；有冷气的） 2 handmade （手工制作的） 3 thunderstruck （非常吃惊的） 4 heartfelt （衷心的；诚挚的） 5 data-based （基于数据的） 6 self-employed （自主 经营的）7 custom-built （定制的；定做的）8 weather-beaten （饱经风霜的） VIII 1. well-informed （对.. 非常熟悉的） 2 new-found （新获得的） 3 hard-earned （辛苦挣得的）4 soft-spoken （说话温柔的） 5 newly-married （新婚的）6 widely-held （普遍认为的） 7 well-meant （出于好意的）8 well-educated （受过良好教育的） IX 1 no matter how different it may seem form any other substance 2 no matter what a woman tries to do to improve her situation 3 no matter what excuse he gives 4 no matter what anyone else may think 5 no matter how they rewrite history X 1 just as we gained fame in victory, we lost nothing in defeat 2 just as the head teacher plays a significant role in the school, Jane plays a significant role f leader in the classroom. 3 whoever was out there obviously couldn ' t see him just as he couldn' t see them. 4 she has bee n search ing all her life for the perfect chocolate just as I have bee n search ing for the perfect beer. 5 you can make those kinds of comparis ons just as you were doing the an alyses a minute ago. XI 1. No matter how experieneed a speaker you are, and how well you have prepared your speech, you will have difficulty making a speech at such a no isy recepti on. 2. Just as all his sister' s friends cared about him, Jimmy cared about them. 3. Car manufacturers stamp a vehicle identification number at several places on new cars to help track dow n stole n vehicles. 4. If you dare tell on me when the teacher gets back I won ' t say a word to you any more.
大学英语语法试题及答案(2) 第 2 单元题目： 1.More people visit the Air and Space Museum honoring men and women who have pioneered flight and the exploration of space than _____ any other monument or museum in the entire country. A) visit B) to visit C) visited D) visiting 题目： 2.I work in a little room off the main entrance _____ museum, checking coats and other articles which people do not want to carry around as they tour the building. A) to B) of C) at D) for 题目： 3.What apparently had happened, three years ago, was that Kate _____ to a different building. A) went B) has gone C) had gone D) would go 题目： 4.She had waited at another museum for days and had spent all her money _____ to find Sidney. A) tried B) trying C) to try D) try 题目： 5.Without facts we cannot form a worthwhile opinion for we need to have factual knowledge _____ our thinking. A) which to be based B) which to base upon C) upon which to base D) to which to be based 题目： 6.Helen believes if a man robs her of five dollars it is the same as if he _____ a hundred. A) takes B) will take C) took D) has taken 题目： 7.He had a cottage which consists _____ three rooms, a bathroom and kitchen. A) of B) with C) in D) by 题目： 8.Behind him Paul could hear the angry man _____ to break the door open. A) trying B) to try C) tried D) try 题目： 9.Some companies have introduced flexible working time with less emphasis on pressure _____. A) than more on efficiency B) and more efficiency C) and more on efficiency D) than efficiency 题目： 10.The gardener is taking care of the place, no one _____ there at present. A) living B) lives C) lived D) to live 题目： 11.The City Bank will pa fifty pounds to _____ who helps the police to catch the man. A) someone B) nobody C) anyone D) somebody 题目： 12.When Paul Carson saw the big red American car coming towards him, he stopped his won car at the side, _____ room for it to pass. A) to make B) made C) making D) make 题目： 13.What bothers me is _____ I paid for all this stuff that we don't want anymore. A) what B) that C) which D) who 题目： 14.A hinge joint is _____ permits forward and backward movement of a door. A) the B) whose C) what D) those 题目：15.Garage sales in the United States serve many purposes _____ cleaning out unwanted items and making money. A) besides B) except for C) except D) apart from 题目： 16.This is _____ the most difficult job I have ever tackled. A) by rights B) by itself C) by oneself D) by far
电路分析基础 练习题 复刻回忆 1-1 在图题1-1所示电路中。元件A 吸收功率30W,元件B 吸收功率15W,元件C 产生功率30W ,分别求出三个元件中得电流I 1 、I 2 、I 3。 解 A,A,A 1-5 在图题 。 解 A,V 1-6 在图题1-6所示电路中,求电压U 。 解 , 1-8 解 电阻功率:W, W 电流源功率:, W 电压源功率:W, W 2-7 电路如图题2-7 解 V A A A 2-9 电路如图题2-9 解 从图中可知,2Ω与3Ω并联, 由分流公式,得 A 所以,有 解得 A 2-8 电路如图题2-8所示。已知,解 KCL: 解得 mA, mA 、 R 为 k Ω 解 (a)由于有短路线,, (b) 等效电阻为 2-12 电路如图题2-12所示。求电路AB 间得等效电阻。
解 (a) (b) 3-4 用电源变换得方法求如图题3-4所示电路中得电流I 。 解 或由( A,A, A 所以 A 4-3 用网孔电流法求如图题4-3 解 显然,有一个超网孔,应用KVL 即 电流源与网孔电流得关系 解得: A,A 电路中各元件得功率为 W,W, W,W 显然,功率平衡。电路中得损耗功率为740W 。 4-10 用节点电压法求如图题4-10所示电路中得电压。 解 只需列两个节点方程 解得 V ,V 所以 V 4-13 电路如图题4-13所示,求电路中开关S 打开 与闭合时得电压。 解 由弥尔曼定理求解 开关S 打开时: V 开关S 闭合时
5-4 用叠加定理求如图题5-4所示电路中得电压U 。 解 应用叠加定理可求得 10V 电压源单独作用时: 5A 电流源单独作用时: 电压为 5-8 图题5-8所示无源网络N 外接U S =2V , I S =2A 时, U S =2V ,I S =0A 时, 响应I =5A 。现若U S =4V,I S =2A 时,则响应I 为多少? 解 根据叠加定理: I ＝K 1U S ＋K 2I S 当U S =2A 、 I S =0A 时 I =5A ∴K 1=5/2当U S =2V 、 I S =2A 时I =10A ∴K 2=5/2 当U S =4V 、 I S =2A 时 响应为 I =5/2×4+5/2×2=15A 5-10 求如图题5-10 解 用叠加定理求戴维南电压 V 戴维南等效电阻为 5-16 用诺顿定理求图题5-16示电路 中得电流I 。 解 短路电流 I SC =120/40=3A 等效电阻 R 0=80//80//40//60//30=10Ω 5-18 电路如图题5-18所示。求R L 为何值时 解 用戴维南定理有,开路电压: V 戴维南等效电阻为 所以,R L =R 0 = 4、8Ω时,R L 可获得最大功率, 其最大功率为 5-20 如图题5-20所示电路中,电阻R L 可调,当R R ＝？ 解:先将R L 移去,求戴维南等效电阻: R 0 =(2+R)//4 Ω 由最大传输定理: 用叠加定理求开路电压: 由最大传输定理: , 故有 U S =16V 6-1 参见图题6-1:(a)画出ms ;(c)求电感提供最大功率时得时刻;(d)求ms 时电感贮存得能量。
1．There is ____ old woman in the car. A．/ B．the C．a D．an 2．We often go to the park ____ Sundays. A．on B．in C．at D．from 3．My book ____ on the desk. A．is B．am C．are D．be 4．Which language is ____ ，English, French or Chinese? A．difficult B．the difficult C．more difficult D．the most difficult 5．---- ____ book is this? ----It's Kate's. A．When B．Why C．Where D．Whose 6．----Can you write a letter in English? ----No, I ____. A．may not B．mustn't C．can't D．needn't 7．I ____ my homework when Mike came last night A．do B．was doing C．am doing D．have done 8．He began to ____ English three years ago. A．learn B．learns C．learned D．learning 9．Jim is a driver, ____ he? A．does B．doesn't C．is D．isn't 10．“What's wrong ____ you?”the doctor asked. A．from B．with C．for D．at 11．He is rich, ____ he isn't happy. A．or B．so C．and D．but 12．----Where is Alice? ----She ____ to the library. A．goes
大学英语语法试题及答案（1） 第1单元 题目: 1.More people visit the Air and Space Museum honoring men and women who have pioneered flight and the exploration of space than _____ any other monument or museum in the entire country. A) visit B) to visit C) visited D) visiting 题目: 2.I work in a little room off the main entrance _____ museum, checking coats and other articles which people do not want to carry around as they tour the building. A) to B) of C) at D) for 题目: 3.What apparently had happened, three years ago, was that Kate _____ to a different building. A) went B) has gone C) had gone D) would go 题目: 4.She had waited at another museum for days and had spent all her money _____ to find Sidney. A) tried B) trying C) to try D) try 题目: 5.Without facts we cannot form a worthwhile opinion for we need to have factual knowledge _____ our thinking. A) which to be based B) which to base upon C) upon which to base D) to which to be based 题目: 6.Helen believes if a man robs her of five dollars it is the same as if he _____ a hundred. A) takes B) will take C) took D) has taken
新视野大学英语读写教 程第三版课后答案 Document number【SA80SAB-SAA9SYT-SAATC-SA6UT-SA18】
Unit 1 TEXT A Language focus Word in use [3] 1.whereby 2. pursuit 3. inhibit 4. maintain 5. patriotic 6. transcend 7. endeavor 8. dedication 9. prestige 10. nominate Word building [4]
[5]
1.resultant 2. tolerant 3. pollutants 4. inhabited 5. participants 6. descendants 7. attendants 8. respectful 9. contestants 10. neglectful 11. resourceful 12. boastful Banked cloze [6] 1.eventually 2. premier 3. endeavor 4. bypass 5. handicaps 6. committed 7. attained 8. transcend 9. feats 10. slightest Expressions in use [7] 1. removed from 2. failed in 3. in pursuit of 4. deviated from 5. precluded from 6. triumph over 7. work their way into 8. written off TEXT B Understanding the text [2]
一、时态 1. By the end of April Peter here for three months. A. will have stayed B. will stay C. stays D. has stayed 2. I'm awfully sorry, but I had no alternative. I simply _____ what I did. A. ought to have done B. have to do C. had to do D. must do 3. We ________our breakfast when an old man came to the door. A. just have had B. have just had C. just had D. had just had 4. Ever since the family moved to the suburbs last year, they________ better health. A. could have enjoyed B. had enjoyed C. have been enjoying D. are enjoying 5. I bought a new house last year, but I ______my old house yet, so at the moment I have two houses. A. did not sell B. have not sold C. had not sold D. do not sell 6. I decided to go to the library as soon as I ________. A. finish what I did B. finished what I did C. would finish what I was doing D. finished what I was doing 7. He _________when the bus came to a sudden stop. A. was almost hurt B. was hurt himself C. was to hurt himself D. was hurting himself 8. I suppose that when I come back in ten years' time all those old houses _______down. A. will have been pulled B. will have pulled C. will be pulling D. will be pulled 9. Bob's leg got hurt ________the Purple Mountains. A. while he is climbing up B. while we were climbing up C. while we climbed up D. while he climbed up 10. Pick me up at 8 o'clock. I _______ my bath by then. A. may have B. will be having C. can have had D. will have had 11. If you smoke in a non-smoking section people________. A. will object B. objected C. must object D. have objected 12. By the end of this month, we surely _______ a satisfactory solution to the problem A. have found B. will be finding C. are finding D. will have found 13. We __________to start our own business, but we never had enough money. A. have hope B. hope C. had hoped D. should hope
Unit 1 The Way to Success Section A 1 Understanding the text. 1 He achieved fame for his wit, wisdom, civic duty, and abundant courage. 2 They were thought to be slow learners in childhood, but they overcame their childhood difficulties and made magnificent discoveries that benefit the entire world today. 3 His strong will. 4 It means to keep their focus on achieving a positive end result, instead of letting small problems get in the way of good results. 5 Because they have the will to overcome profound obstacles and to work diligently in the pursuit of their goals, and have the passion for success. 6 Because firms preferred to hire less qualified men rather than risk hiring a female lawyer, which was unprecedented. 7 We should never give up on our dream, and one day we can change the world and make it a better place. 8 The secret of success is built upon a burning inward desire---a robust, fierce will and focus---that fuels the determination to act, to keep preparing, to keep going even when we are tired and fail. 2 Critical thinking 1 You may have tried and failed many times before you finally get success. But
（英语）高中英语语法填空试题(有答案和解析) 一、语法填空 1．阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 A few months ________(early), Stephanie Heller, had finished her workout in the gym when she ________(notice)a woman in the parking lot struggling to bend down. Ms. Heller offered to help her. The woman blamed old age for her incapacity, ________(explain)that she was 70. But Ms. Heller was 71. "This woman felt every bit her age." she recalled. "I don't let age stop me. I need a good mood, really. I love singing and dancing with all the young friends I ________ (make)over the years. I'm only as old as I feel." Each of us has ________actual age, the number we celebrate on birthdays. But some 50-, 60-and 70-year-olds look and feel ________(youth), while others do not. Scientists measure these differences by looking at age-related things like skin elasticity, blood pressure and so on, finding some ________(connect)among them. People ________a healthy lifestyle and a fortunate genetic inheritance(继承)tend ________(score) "younger" on these assessments. When scientists ask, "How old do you feel, most of the time?" the answer can reflect the state of people's physical and mental health. The age given is a virtual one, ________is called "subjective age". 【答案】earlier；noticed；explaining；have made；an；youthful/young；connection/connections；with；to score；which 【解析】【分析】本文是一篇说明文，有的人看起来比实际年龄小，是因为健康的生活方式，好的遗传基因让人看起来更年轻，研究发现一个人的心态可以反应他的主观年龄。（1）考查形容词。根据后文的had finished过去完成时，可判断事情发生在过去之前，a few months earlier“几个月之前”，可以和过去完成时连用，故填earlier。 （2）考查时态。根系句子可知此处是从句谓语动词，此处考查固定句型had done…when(从句用一般过去时)刚做完某事突然就……，故填noticed。 （3）考查非谓语动词。分析句子可知此处是非谓语动词作状语，逻辑主语the woman和explain（解释）之间是主动关系，应用现在分词，故填explaining。 （4）考查时态。分析句子可知此处是定语从句谓语动词，根据下文的over the years(在过去几年里)判断该句为现在完成时，主语为I，故填have made。 （5）考查冠词。age的可数名词，此处是泛指，应用不定冠词，又actual是元音音素开头，故填an。 （6）考查形容词。此处应填形容词作为feel的表语，youth的形容词是young和youthful，故填young/youthful。 （7）考查名词。此处应填名词作为finding的宾语，connect的名词形式connection为可数名词，some可以理解为“一些/某个”，故此处可以用名词单数形式，也可用复数形式，故填connection/connections。 （8）考查介词。句意：拥有健康生活方式和好的遗传基因的人倾向于在这些评价中获得高分。分析句子可知此处应填介词，再结合句意表示“有”的介词是with，故填with。（9）考查非谓语动词。tend to do sth固定短语，“倾向于做某事”，故填to score。