长沙理工大学研究生考试试卷B
长沙理工大学考试试卷汽车构造试题附答案
长沙理工大学考试试卷………………………………………………………………………………………………………………试卷编号 A 拟题教研室（或教师）签名教研室主任签名………………………………………………………………………………………………………………课程名称（含档次）汽车构造课程代号08020025专业汽服、车辆层次（本、专）本考试方式（开、闭卷）闭卷一、填空题（请在每小题的空格中填上正确答案。
本题总分20分，每个空1分题）1、活塞的基本构造可分为、、三个部分。
沿轴线方向成上下的锥形。
2、惯性锁环式同步器的锁止部件是，锁销式同步器的锁止部件是。
3、液力变矩器主要由、和三部分组成。
4、化油器由、、、、等五大供油装置组成。
5、大货车的万向传动装置一般由、、组成。
前置前驱轿车靠主减速器处为球笼式万向节，靠车轮处为球笼式万向节。
二、选择题（请在每小题的备选答案中，选出一个正确答案。
本题总分10分，每小题1分）1、发动机用于平衡旋转惯性力及其力矩的平衡重一般设在（）。
A. 曲轴前端B. 曲轴后端C. 曲柄上2、在排气上止点( )。
A. 进气门开启、排气门关闭B. 排气门开启、进气门关闭C. 排进气门同时开启3、以发动机转速和进气量作为基本控制参数的汽油喷射系统为（）。
A. D型汽油喷射系统B. L型汽油喷射系统C. K型汽油喷射系统4、当上行柱塞上的斜槽与柱塞套上的油孔相通时，柱塞式喷油泵（）。
A. 准备喷油B. 开始喷油C. 结束喷油5、现代轿车水冷系一般使用（）节温器。
A．蜡式B．膨胀筒式C．乙醚式第1页（共 1 页）6、液力变矩器中用于增大扭矩的零件是（）。
A. 泵轮B. 导轮C. 涡轮7、当把驱动桥架空，传动轴固定，转动一边驱动轮，另一边驱动轮必然（）转动。
A. 同向等速B. 反向等速C. 反向不等速8、子午线轮胎的帘线排列方向与轮胎子午断面（）。
A. 斜交B. 垂直C. 一致9、为调整前轮前束，转向横拉杆两端切制的螺纹（）。
样卷3
长沙理工大学课程考核试卷（B卷）2013――2014学年第1学期命题教师签名: 审核教师签名：课号：0502000055课名：英语报刊选读考试考查：考试此卷选为：期中考试（）、期终考试（√）、重考（）试卷年级专业学号姓名得分题项I II III IV Total得分Part I. Reading ComprehensionDirections: There are 3 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choicePassage OneUniversity’s Boot Camp Gives Freshmen Fighting ChancRENO, Nev. -- Welcome to boot camp, you maggots.Stand up straight, suck in that gut and recite the periodic table.What did you say? I can’t hear you! Drop and give me 20.When the University of Nevada, Reno holds its first academic boot camp Aug. 16-20, there won't be any snarling drill instructors ordering freshmen to scrub the latrines with toothbrushes, but it won‘t be easy, either.They will spend five days, from 8 a.m. to 9 p.m., attending classes, working in study groups and taking exams.Just as basic training prepares soldiers for combat, the goal of UNR‘s new boot camp, called Biofit, is to help freshmen majoring in certain scientific fields improve their chances of surviving that fragile first semester of college.―S tudents of all levels of preparation come here, and some of them struggle that first semester,‖said Jeff Thompson, dean of UNR‘s College of Science. ―And studies show that if students struggle that first semester, it‘s very hard for them to overcome.‖Struggling students also are at risk of dropping out, and UNR is on a mission to improve its graduation rate.Last year, slightly more than half of the freshmen who entered UNR in 2006 graduated.The graduation rate in 2012 for UNR students who earned a diploma in six years was 54 percent. That's 2 points below the national six-year graduation rate of 56 percent.Another hopeful indicator is UNR‘s retention rate: 79 percent of the freshmen who came on campus in 2011 were still enrolled when the next fall semester began.Attending the boot camp is voluntary, and during its first year, enrollment will be limited to freshmen who plan to major in biology or neuroscience.―It‘s a test run with no risk to them,‖ Thompson said. ―They have the opportunity to make adjust ments before they get a poor grade that first semester that‘s hard to recover from. That‘s really what we‘re trying to address.‖The students will live in the same residence hall and have to pay $200, which will cover food, room and program materials.UNR joins a growing number of campuses that offer this type of experience to help freshman successfully make the transition from high school to college.Louisiana State University held the first weeklong boot camp in 2005 for new freshmen biology majors at its College of Science, where Kevin Carman was the dean at the time.Carman, who became UNR‘s new provost in February, made starting a boot camp at UNR one of his top priorities.Thompson said LSU‘s boot camp has increased student graduation rates for new freshmen by 50 percent.―That is very significant,‖ he said.He credits that improvement to the way boot camp exposes freshmen to the tougher academic requirements of higher education before they start their first semester.―The point of boot camp is that college is very different, but most students don‘t really understand that,‖ Thompson said.They can hear that message repeated by UNR recruiters, high school counselors and their parents, but the boot camp experience drives it home, he said.―We try to compre ss into a fairly short time what it is like to be a university student,‖ Thompson said.The students will attend several classes each day, take exams and get feedback on how they did.Although the first Biofit boot camp will be open only to biology and neuroscience majors, Thompson wants to offer it next year to all of the incoming freshman in the College of Science.―Provost Carman eventually wants to expand this across as much of the university as we can,‖ Thompson said.Other universities have boot camps for students majoring in theater, engineering and business as well as for disabled veterans and high school graduates who are smart but at-risk because of bad study habits.Christina Cho, UNR‘s director of advising, recruitment and retention for the College of Science, said the college is recruiting undergraduates majoring in biology and neuroscience to serve as mentors for the boot camp students.Biology majors Brandy Reynolds and Chris Gomez, two undergraduates who will mentor freshmen in the upcoming boot camp, said they could have used some help adapting to university life when they first came on campus.―One of the hardest things I had to deal with from a social aspect was having to deal with a roommate who was a slob, but he moved out six weeks into the semester,‖Gomez said. ―Then there were five guys who lived on the same floor and played video games until five in the morning.‖On the academic side, Gomez, who wants to become a dentist, and Reynolds, a pre-med student, found the work load much harder than they expected.―You have to learn to manage the credit load and the intensity at which each professor teaches their class,‖ Gomez said. ―In an hour and 15 minutes they go through two-and-a-half chapters of information.‖Freshmen will learn that exams are crucial to their grades, Reynolds said.―In a lot of the courses you take, the grades are based mainly on exams, whereas in high school, you had homework and extra credit that could boost your grades in the end if you messed up on a test,‖ she said. ―That‘s not the case so much in college.‖Gomez said the newly found freedom that freshman experience when they leave home poses another danger, Gomez said.―Some freshmen are like, ‗I‘m away from mom and dad and there‘s a party down the street and I can sta y up until 3 in the morning,‘‖ he said.―But if you only get two hours sleep, you're probably not going to function well the next day. So with that freedom comes responsibility and knowing your limits,‖ Gomez said.(By Lenita and Reno Gazette, from USA TODAY, May 12, 2013.) Choose the right answer to the following questions:1．What do freshmen do in the academic boot camp?A.They are to be trained for combat.B.They scrub the latrines with toothbrushes.C.They overcome their shortcomings.D.They attend classes, work in groups and take exams.2. What is the purpose of UNR‘s boot camp?A. To improve the chance of surviving their first semester of university.B. To improve the graduation rate.C. To improve the retention rate.D. All of the above.3. According to Thompson, which of the following statement is NOT true?A. College is very different from middle school.B. The boot camp can help freshmen change their roles from middle school students tocollege students in a short time.C. The boot camp is open to all of freshmen.D. Freshmen can have chance to experience tougher academic requirements of highereducation before the start their university.4. What do we know about mentors?A. They are always majoring in biology and neuroscience.B. They are undergraduates.C. They help freshmen to adapt to college life.D. All of the above.5. What freshmen should NOT learn before they begin their first semester?A. To manage the credit load.B. Exams are crucial to their grades.C. College is more freedom than at home.D. The intensity of academic study is very hard.（1-5 DDCDC）Passage TwoHere‘s some good news for parents of tweens and teens: You rule.That may be hard to believe sometimes. And it‘s true kids won‘t always follow your health and safety rules. But studies show parents who keep setting boundaries make a huge difference.The latest example is a survey on media use by the Kaiser Family Foundation. It found that typical kids ages 8 to18 spend an astonishing 7 hours and 38 minutes a day consuming entertainment media, including deeply in TV, computer, games, cellphones, music players and other devices while occasionally glancing at books and other non-electronic media. Many experts, including the pediatrics (小儿科) academy，consider that much screen time bad for mental and physical health.But the study also found that kids whose parents set any time or content limits were plugged in for three hours less day.‖ Parents can have a big influence ,‖ says Kasier Vicky Rideout.―The reality is that teenagers care deeply what their parents think,‖ says Kenneth Ginsburg, a specialist of the Children‘s Hospital of Philadelphia. ―the challenge for parents is to get across rules and boundaries in a way that doesn‘t feel controlling.‖Research shows that parents who set firm rules but explain and enforce in a warmsupportive way work better than those who set no rules, fail to enforce them or rule with a ―because I said so‖ iron grip.Ideally, ―kids understand the rules are about their well-being and safety,‖ Ginsburg says.Still, achieving just-right parenting is ―challenging‖‘ says Margaret Broe-Eitzpatrick, a teacher in Kensington, Md. ,who has four children, age 8 to 16.‖There are so many different things to keep track of.‖ She and her h usband keep their kids busy with sports and other activities, limit screen time and review the music their children download. They talk with their 16-year-old son about the rules he‘ll face when he gets a driver‘s license soon. But she says, they can‘t pol ice everything the kids encounter on the Internet or in friends‘ homes.―We‘re just doing the best we can ‗‖ she says ‗‖even if young people may protest at first, they do feel more safe and secure when limits are set.‖6. The survey by the Kaiser Family Foundation is mentioned to illustrate the idea that_____.A)Kids don‘t always follow parents‘ rules B) only few parents believe thegood newsC)Much media use results in bad health D) parents‘ rule make a hugedifference7. What did the kids do when parents set any time or content limits, according to the Kaiser Family Foundation?A)They cut down on their screen time. B) They appreciated their parents‘ love.B)They spent more time staying outdoors. D) They accepted parents‘ rulesunwillingly.8. What will Kenneth Ginsburg most probably suggest that parents should do?A) Avoid setting firm rules. B) Avoid ruling with an iron grip.C) Set rules after family discussion. D) Set rules that are easy to understand.9. Margaret Broe-Fitzpatrick finds it impossible_____.A) to achieve just-right parenting B) to keep track of everything done by the kidsC) for the kids to face rules alone D) for the kids to observe rule without protest10. The passage is mainly intended for parents_____.A ) whose kids have difficulty in self-discipline B) whose kids are addicted to media useC ) Who have doubts about setting rules D) who are too busy to care for their kids（答案：6-10 DABBC）Passage ThreeEarlier this year I met with a group of women in Matela, a small farming village in Tanzania, and we discussed something that‘s been on all of our minds lately: finding a safe place to save money. The women said their babies were getting sick form malaria,and they could afford the drugs if they saved money over time-but with no access to formal savings accounts, they had a hard time safeguarding cash. So they saved in risky and inefficient ways. They made loans to each other, or bought goats or jewelry, then sold them if they suddenly needed money.The success of microloans has opened new opportunities for many poor people and has been a crucial factor in reducing poverty. But loans are not enough. Savings accounts could help people in the developing world with unexpected events, accumulate money to invest in education, increase their productivity and income, and build their financial security. Fortunately, this is a moment of opportunity. New policy ideas are uniting in ways that will lower the cost of savings and bring safe financial services to the doorsteps of the poor.One exciting trend is agent banking in which stores and post offices serve as banking outlets. Banks still manage and guarantee the deposits, but they rely on the infrastructure of other outlets to deal with clients where there are no bank branches. The phenomenal growth of mobile phones in the developing world presents another opportunity. M-Pesa , the mobile-phone cash-transfer service in Kenya, has signed up more than 5 million subscribers in two years and recently expanded to Tanzania. This new idea is opening markets and transforming lives. A split-second M-Pesa transaction cots as little as 30 cents and replaces a day of risk and expense just to send someone money or carry earnings home.At the Gates Foundation, it has been committed more than $350 million to make financial services widely accessible to the poor because safe places to save can help break the cycle of poverty. If action is taken on this moment, then within a generation, billions of people will have the chance to build up their saving and live the healthy, productive lives that they deserve.11. According to the first paragraph, people in Matela are most likely to expect that_____A) They can afford the cure for malaria B) They can save their cash efficientlyC) They can live safely in the village D) Their can get rid of poverty soon12. What can help the poor build financial security?A) Getting B) Lower cost of savingC) Chances for education D)Saving services13. What is the role of post offices in ―agent banking‖?A) They are subordinate to banks. B) They are cooperative with banksC) They are taking the place of banks D) They are being changed into banks14.. Compared with agent banking, M-Pesa most probably______A) is less practical for poor people B) is more popular among clientsC) costs less except transaction fees D) provides safer savings accounts15.Gates Foundation intends to make financial services______A) affordable B)widely recognized C).influential D)easily obtained （答案：11-15 BDBCD）Part II. Reading in DepthDirections: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter or a combination of letters. Please choose the corresponding letter or combination for each item on. You may not use any of the words in the bank more than once.And yet, even as the financial pages wrote the paper‘s obit, deep within that fancy Renzo Piano palace across from the Port Authority, something hopeful has been going on: a kindof---16---. Each day, peculiar wings and gills poke up on the Times‘ website—video, audio,―drillable‖ graphics. Beneath Nicholas Kristof‘s op-ed column, there‘s a--17--to his blog, Twitter feed, Facebook page, and YouTube videos. Coverage of Gaza –18-- a time line linking to earlier reporting, video coverage, and an encyclopedic entry on Hamas. Throughout the—19-- glittering interactive maps let readers –20--voting results. There were 360-degree panoramas of the Democrat ic convention; audio ―back story‖ with reporters like Adam Nagourney; searchable video of the debates. It was a –21--reinvention of the Times voice, shattering the omniscient God-tones in which the paper had always grounded its –22--; the new features tugged the reader closer—23--comments and interactivity, rendering the—24-- between reporter and –25-- more intimate, immediate, exposed..A) audience B)coverage C) relationship D) radical E)throughF) plumb G) features H) election I) distract J) linkK)evolution L) invalid M) conforms N) issued N) deal（16. K 17.J 18G 19H 20.F 21D 22.B 23.E 24.C 25.A ）Part III To Detect the InformationDirections: In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once.A) .Michelle , Stetson MBA graduate, dreamed in college of owning her own business and conducted informational interviews with entrepreneurs. ―This experience was eye-opening to say the least,‖ Michelle says. ―Until interviewing the folks I talked to, I had an almost romantic notion of being in business for one‘s self. After our discussions, I had a better picture of the trials, heartaches and triumphs involved.‖Based on what she learned, Michelle chose to learn the ropes from the corporate world before venturing her own enterprise.B). Management graduate J.P. Politano notes that before he conducted his informational interviews he was completely unsure of what kind of job he wanted.―Speaking with my interviewee made me realize that many of my points ofview ,experiences, and desires pointed me to a field like consulting, but I had never known it until we talked. It was introduced for the first time to something that I had been seeking for years, but was unsure of what it was,‖ Politano says.C ) You can narrow a wide field down to a special job. ―Informational interviews helped me to learn more about what areas of accounting I may want to enter and chose areas that I don‘t ,‖ says Tina , a senior accounting major at Stetson.D）Many job seekers learn through informational interviews that the career‘s average salary, hours, working conditions, or opportunities for advancement are not what they imagined. I actually thought of going into law, Says Stetson marketing senior Miller, ―but I decided against it‖, partly ,Miller says , From hearing an attorney‘s first hand experience that they have such crazy hours that can be very stressful.E）Although the interviewee offered a negative view of the law profession, the interviewing process showed her law was the right choice for her. ―Since my interviewees were all of different ages and genders, I got a grasp of the feeling each one had for the field. They made me realize how I would like to be as an attorney. F) . When we meet people for the first time, we often make decisions about them based on how they look. And, of course it‘s something that works both ways, for we too are being judged on our appearance. When we look good, we feel good, which in turn leads to a more confident and self-assured manner. People then pick up on this confidence and respond positively towards us. Undoubtedly, it‘s what‘s inside that‘s important, but sometimes we can send out the wrong signals simply by wearing inappropriate clothing or not spending enough time thinking about how others see us.G) For example, people often make the mistakes of trying to look like someone else they‘ve seen in a magazine, but this is usually a disaster as we all have our own characteristics. Stand in front of a full length mirror and be honest with yourself about what you see, There is no need to dwell on your faults—we all had good points and bad points---bue think instead about the best way to emphasize the good ones.H) When selecting your clothes each day, think who you‘re likely to meet, where you‘re going to be spending most of your time and what tasks you are likely to perform. Clearly , some outfits will be more appropriate to different sorts of activity and this will dictate your choice to an extent. However, there‘s no need to abandon your individual taste completely. After all, if you dress to please somebody else‘s idea of what looks good, you may end up feeling uncomfortable and not quite yourself.I) But to know your own mind, you have to know yourself. What do you truly feel good in ? There are probably a few favourate items that you wear a lot---most people wear 20 per cent of their wardrobe 80 per cent of the time. Look at these clothes and ask yourself what they have in common. Are they neat and tidy? Loose and flowing? Then look at the things hanging in your wardrobe that you don‘t wear and ask yourself why. Go through a few magazines and catalogues and mark the things that catch your eyes. Is there a common theme?J）Some colors bring your natural colouring to life and others can give us a washed-out appearance . Try out new colors by all means, but remember that dressing in bright colors when you really like subtle neutral tones, or vice versa, will make you feel self—conscious and uncomfortable. You know deep down where your own taste boundaries lie. And although it is good to challenge those sometimes with new combinations or shades, take care not to go too far all at once.26. Learn about the Realities of the Work World and What to expect.27. Discover potential opportunities.28. Affirm your dream career.29. Find the career you wanted may be wrong for you.30. Distinguish which career path to follow.31. Learning to be realistic.32. Making regular conscious choices.33. Analyzing your own taste.34. Being cautious when experimenting35. One‘s appearance may send out mixed information（26-35ABEDC G H I J F）Part IV TranslationDirections: translate the following sentences into Chinese:36. But souring prices and gas lines and growing crime as told to us by our parents and throughgritty world of Taxi Driver still stands out to me as what true economic calamity is all about.（但是通过父母的的讲述以及电影《出租车司机》所反映出的逼真世界，我们了解到那时候物价和燃气价格飞涨，犯罪率急剧上升，这些都清晰地向我展示出经济灾难的真实面目。
长沙理工大学考研电路06-10年真题及答案
长沙理工大学2006年研究生入学考试试题考试科目：电路考试科目代码： 442注意：所有答案（含选择题、填空题、判断题、作图题等）一律答在答题纸上；写在试卷纸上或其他地点一律不给分、作图题可以在原试卷题图上作答，然后将“图”撕下来贴在答题纸上的响应位置。
一、图1所示电路中，用结点电压法求电流I1及电压源发出的功率。
（l5分）二、图2所示电路中，网络N 仅由电阻构成，图a 中，当R ＝5Ω时，I 2＝2A ;当R ＝0时，I 2＝4A 。
求图b 中电流2I 和1I 。
三、图3所示电路原已达稳态，开关S 在t=0时闭合，求t ≥0时的响应u C (t)和i L (t)。
四、图4所示正弦稳态电路中，u S (t)= 502cos ωtV ，ωM=10Ω，ωL 1＝20Ω，ωL 2＝40Ω，11C ω＝21C ω＝10Ω，31C ω＝30Ω，R 1＝3Ω，R 2＝2Ω。
求电压源 发出的有功功率和无功功率。
（15分）五、图5所示三相电路中，Z 1＝2+j1Ω，对称三相负载Z ＝18+j15Ω，单相负载R =10Ω，线电压为380V ，求负载相电流I∙AB 、I ∙A ’B ’ 及三相电源供给的总有功功率P 。
（15分）六、图6所示虚线框内为一无源线性二端口网络，求：1）网络的Z 参数。
2）若在1-11端口加电压U 1＝50V ，2-21端口接R L =5.5Ω时，求电压源发出的功率和R L 吸收的功率。
（15分）七、图7所示电路中，u S （t ）＝10+902cos （ωt+30o ）+182 cos （3ωt ）V,R =18Ω，ωL ＝3Ω，1C ＝27Ω，求：1）电流i 和电压u 的有效值；2）功率表的读数；3）i 的瞬时值。
(15分)八、列写图8所示电路状态的矩阵形式，已知：R 1＝R 2＝R 3＝2Ω，C 3＝1F ，L 4＝1H ，L 5＝2H 。
(15分)九、图9所示电路中，N0为无源线性时不变网络，已知单位阶跃响应u0（t）＝(2.5--t e-1.5-2te).ε（t）V，求当i S（t）=(402cos2t) .ε（t）A时，u0（t）的稳态响应。
长沙理工大学研究生入学考试复试真题-三套
一、选择题（单选与多选题）（每题1分，共15分）1．连续配筋砼路面的纵向配筋率与（）有关。
A．缝宽 B.缝距C. 砼板的厚度D.钢筋的屈服强度2．构成路基的三要素是（）。
A．路基宽度 B.地面横坡度C. 路基高度D.路基边坡坡度3．路基土的最佳含水量与（）有关。
A．压实功 B.初始含水量C. 土类D.塑性指数4．路基土的稠度与（）有关。
A．含水量 B.塑限C. 压实度D.液限5．SMA的特点有（）。
A．粗集料多 B.细集料多C. 沥青多D.中间集料少6．我国刚性路面设计理论为（）。
A．弹性地基上的小挠度弹性薄板理论B. 弹性地基上的弹性厚板理论。
C. 文克勒地基上的小挠度弹性薄板理论。
D. 文克勒地基上的弹性厚板理论。
7．土基回弹模量的确定方法有（）。
A．查表法 B.换算法C. 室内试验方法D.现场检测方法8．以下属于路基地下排水设施的有（）。
A．排水沟 B.渗沟C. 盲沟D.渗井9．水泥混凝土路面损坏状况评价指标有（）。
A．断板率 B.接缝传荷能力C. 脱空D.平均错台量10．横缝设传力杆的主要作用是（）。
A．提高接缝传荷能力 B.减少基层冲刷C. 减薄面层 D.减薄基层11．在路面结构设计中，土基模量是指下列哪个模量（）。
A．切线模量 B.割线模量C. 回弹模量D.弯拉模量12．松散粒料材料的强度是用（）表征。
A．粘结能力 B.内摩擦角C. 抗拉强度D.抗压强度13．评定路表抗滑性能的指标有（）。
A．BPN B.SFCC. 平整度D.TD14．水泥混凝土路面接缝传荷机构有（）。
A．集料嵌锁 B.传力杆C.传力杆和集料嵌锁D.拉杆15．下列属于水泥路面破坏形式的有（）。
A．开裂 B.断板C. 车辙D.接缝损坏二、判断题（每题1分，共15分）1 不论水泥混凝土路面的横缝是何种形式，均不配拉杆。
（）2 有透水性好的填料填筑的浸水路堤，分析其在水位骤降时的稳定性，需考虑动水压力的作用。
（）3 压实功增加，路基土的最大干密度增大，最佳含水量减少。
长沙理工大学821电路2005-2013 2015-2020真题汇编
长沙理工大学2005年攻读硕士学位研究生入学考试试题（答案必须写在答题纸上，答题纸和试卷一并装入试题袋中，否则无效）考试科目名称及代码：电路44141341学科、专业：电力系统及其自动化、高电压与绝缘技术一、图1所示电路中，用结点电压法求9V电流源发出的功率。
（l5分）二、图2所示电路中，当开关S闭合时，求电流I；当开关S打开，求电压U S。
三、图3所示电路中，N C为含源线性电阻网络，已知S闭合情况下，R L＝∞时，U=30V；R L＝3Ω时，R L为获得最大功率，求开关S断开时，R L取何值才能获得最大功率，并求此最大功率。
12四、图4所示电路原已达稳态，开关S 在t=0时闭合，求t≥0时的响应u C （t ）。
五、图5所示正弦稳态电路中，端口2-21开路，已知输入端口电压U ∙S 与I ∙S 同相位，电路消耗功率为1000W，U S ＝400V,R 1＝20Ω,R 2＝R L ,R 3＝10Ω,求：1）电流有效值I 、I L 、I C 和电压u 2的瞬时表达式；2）R 2、X L 、X C ；3)作电路的向量图。
六、图6所示电路中，N 为不含独立电源的线性时不变网络，u S (t)为激励，u(t)为响应，已知其零输入响应为-t e V （t>0），设初始条件不变，u S (t)=δ(t)V时，全响应为3-t e V （t>0），试求：1）u S (t)=ε（t-1）V 时的全响应；2）u S (t)=102cos （t+60o ）V 时的正弦稳态响应。
3七、图7所示电路中，N 为无源线性电阻网络，其传输参数为A=5，B=6，C=1.5，D=2，求R L 获得最大功率时，10V 电压源提供的功率。
八、图8所示电路中，已知非线性电阻伏安特性为：i=g(u)=0.25u 2（u>0）A 直流电压源U S =12V，小信号电压源u S (t)=20cosωt ，mV ，试求电压u 和电流i 。
长沙理工大学2007年研究生试题
2 2 2 ； （b ） h ； （c）h cos g cos g g
图 3
代码：417
代码：417
共 4 页，第 3 页
共 4 页，第 4 页 4、已知用欧拉法所表示的流速场为 ux yz t ， u y xz t ， uz xy ， t 为时间。要 求： （1）求 t 3 秒时，点（2，3，1）处液体质点的加速度； （2）判断该流动是否为有势流动； （3）判断该流场中任一质点有无线变形及角变形。 （8 分） （6 分） （10 分）
（1）容器左侧 U 形管 F 中的 h 值为多少？ （2）容器右侧两测压管 A 、 B 的 h1 及 h2 各为多少？ （8 分） （12 分）
2n2l
R
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适用于那种流动状态，并说明其适用于哪个流区。 （这里：
（8 为断面平均流速； n 为糙率； l 为流程长度； R 为水力半径） 分） 3、 “棱柱体明渠的水面曲线只有 12 种”这种说法对吗？为什么？（6 分） 4、 “实际液体流经固体边界时，边界层内通过的流量要比理想液体情况下在同一范围内所通过 的流量小”简述这种说法正确与否的理由。 分） （6 二、选择填空题（5 分+10 分+9 分=24 分） 1、当水流条件一定时，随着液体动力粘度 的增大，紊流附加切应力将是 。 （5 分） （ a ）增大的； （ b ）不变的； （ c ）减小的 2、 对于 cos ≠1 的大底坡棱柱体明渠， 在临界流的条件下， 其断面平均水深为 。 （10 分） （a）h
2G 2 d
（16 分）
图
5
代码：417 代码：417
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闸下游渠中水深为 ht ，闸下收缩断面水深为 hc ，闸孔出流的流速系数为 。试证明该闸孔为自由出 流的条件是
长沙理工大学考试试卷计算机网络
一、选择题（本题总分30分，每小题2分）1）集线器的主要作用是（ A ）。
A、连接两个相同的局域网网段B、在局域网中用于数据交换C、实现两个具有不同网络协议的网络互连D、连接具有相同类型和不同类型的大型网络2）在以太网中，使用（B ）方法进行介质访问。
A、优先级B、CSMA/CDC、轮询D、CSMA/CA3）网络设备（C ）通常工作在OSI模型的物理层。
A、路由器B、网桥C、中继器D、网关4）网络中常用的接口为（C ）。
A、USBB、PCIC、RJ-45D、RJ-115）B类地址的网络号使用（C ）个8位字节。
A、4B、3C、2D、16）SMTP协议的主要功能是（C ）。
A、提供有关网络设备的管理信息B、在路由器接口层监控C、在主机之间传输邮件D、提供端口利用信息7）网卡的基本功能是（A ）。
A、信号收发B、路由选择C、网络控制D、安全检测8）文件传输协议FTP属于（C ）的通信协议。
A、网络层B、运输层C、应用层D、物理层9）因特网经常采用（D ）算法进行域名解析。
A、路由解析B、控制C、地址绑定D、递归10）下面论述中不正确的是（C ）。
A、IPV6具有高效IP包头B、IPV6增强了安全性C、IPV6地址采用64位D、IPV6采用主机地址自动配置11）UDP提供面向（D ）的传输服务。
A、端口B、地址C、连接D、无连接12）超文本传输协议HTTP所用端口号为（D ）。
A、10B、20C、40D、8013）超文本传输协议HTTP利用（B ）协议传送数据。
A、IPB、TCPC、UDPD、DNS14）（B ）不是广播型网络基本拓扑结构。
A、总线网B、环型网C、星型网D、蜂窝型网15）一个C类IP地址如果分成8个子网，掩码为（C ）。
A、B、C、D、二、填空题（本题总分30分，每小题3分）1）21世纪是一个以（网络）为核心的信息化时代。
2）计算机网络的主要功能是（资源共享）、数据通信和分布式处理。
3）计算机网络一般包括计算机系统、通信线路和通信设备、（网络协议）和网络软件四个部分。
长沙理工大学研究生考试试卷B
长沙理工大学研究生考试试卷课程名称 矩阵论 （B 卷） 拟题老师签名 教研室主任签名 课程编号 适应班级（年级） 研一 2009至 2010 学年 一 学期 考 试 ………………………………………………………………………………………………………………………一、判断题（104⨯分）。
1、矩阵n n C A ⨯∈相似于对角矩阵，则此矩阵所有特征值的代数重数等于几何重数.……( )2、若存在矩阵P ∈C n n ⨯，使得A=P H P ，则A 是正定矩阵。
……………………………( )3、对任意矩阵 n m C A ⨯∈，A A H 的秩与A 的秩相同.………………………………………( )4、n n C ⨯上1||||m A ，∞||||A 两种矩阵范数不等价.………………………………( )5、n C x ∈，n n C U ⨯∈是一酉矩阵，则22||||||||x Ux =.………………………………………( )6、设A n m r C ⨯∈，(r>0),),...2,1(r i i =σ是A 的非零奇异值，则∑==ri i F A122σ…………( ) 7、矩阵级数∑+∞=0)(k k A收敛的充分必要条件是正项级数∑+∞=0)(||||k k A 收敛，其中||||⋅是n n C ⨯上任意 一种矩阵范数.……………………………………………………………………………( )8、任意矩阵都存在满秩分解，且分解是唯一的.……………………………( ) 9、n n C A ⨯∈是Hermite 矩阵，则对nC x ∈≠0，λ≤x x Ax x H H ，其中λ是A 的最大特征值.…( ) 10、设n n CA ⨯∈，则n n C ⨯上任一矩阵范数||||⋅，均有||||)(A A <ρ。
………………………..( )二、求酉矩阵U ，使AU U 1-为对角矩阵，其中⎪⎪⎪⎭⎫ ⎝⎛---=10001i i i i A .(12分)三、设n m ij a A ⨯=)(，列向量n C ∈α，证明：矩阵范数||max ||||,ij ji a mn A ⋅=与向量的2-范数相容. (12分)四、已知A =⎪⎪⎪⎭⎫ ⎝⎛010100012，求A e At cos ,. (12分)五、已知矩阵A=⎪⎪⎪⎭⎫ ⎝⎛-212240130,求A 的QR 分解。
长沙理工考研试题及答案
长沙理工考研试题及答案一、选择题（每题2分，共10分）1. 下列关于长沙理工大学的描述，哪一项是不正确的？A. 长沙理工大学位于湖南省长沙市B. 长沙理工大学是一所以工为主，工学、理学、管理学、文学、经济学、法学等多学科协调发展的全日制普通高校C. 长沙理工大学的校训是“厚德博学，求实创新”D. 长沙理工大学成立于2000年答案：D2. 长沙理工大学的校徽中包含了以下哪些元素？A. 齿轮B. 书籍C. 火炬D. 以上都是答案：D3. 长沙理工大学的校歌名称是什么？A. 长沙理工之歌B. 理工之光C. 理工辉煌D. 理工梦想答案：B4. 下列哪一项不是长沙理工大学的学术传统？A. 严谨求实B. 开拓创新C. 追求卓越D. 保守传统答案：D5. 长沙理工大学的图书馆藏书量超过多少万册？A. 100B. 200C. 300D. 400答案：C二、填空题（每题2分，共10分）1. 长沙理工大学的校训是“_________，_________”。
答案：厚德博学，求实创新2. 长沙理工大学的校歌名称是“_________”。
答案：理工之光3. 长沙理工大学成立于_________年。
答案：19784. 长沙理工大学的校徽中包含了_________、_________和_________等元素。
答案：齿轮、书籍、火炬5. 长沙理工大学的图书馆藏书量超过_________万册。
答案：300三、简答题（每题5分，共20分）1. 简述长沙理工大学的发展历程。
答案：长沙理工大学的发展历程可以概括为三个阶段：1978年，学校前身长沙基础大学成立；1994年，更名为长沙理工大学；2000年，与长沙交通高等专科学校合并，形成了现在的长沙理工大学。
2. 长沙理工大学在学术研究方面有哪些特色？答案：长沙理工大学在学术研究方面特色鲜明，特别是在工程领域，如土木工程、交通工程、环境工程等方向具有较强的研究实力和影响力。
3. 长沙理工大学的校园文化活动有哪些？答案：长沙理工大学的校园文化活动丰富多样，包括学术讲座、文艺演出、体育竞赛、志愿服务等，旨在培养学生的综合素质。
长理考研真题答案
长理考研真题答案长理考研真题答案考研是每年都会面临的一项重要考试，对于许多想要深造的学子来说，考研是他们实现人生目标的关键一步。
而在备考过程中，真题的重要性不言而喻。
长理考研真题作为备考的重要参考资料，对于考生来说具有重要的指导作用。
本文将从不同学科的角度，分析长理考研真题的答案。
首先，我们来看看数学科目的长理考研真题答案。
数学作为考研的一门重要科目，对于很多考生来说是一个难点。
在解答数学题目时，考生需要准确地计算出结果，并给出详细的解题过程。
长理考研真题的答案通常会给出详细的解题思路和步骤，这对于考生来说是非常有帮助的。
通过仔细研究长理考研真题答案，考生可以更好地理解题目的解法，提高解题的准确性和效率。
接下来，我们来看看英语科目的长理考研真题答案。
英语作为考研的一门必考科目，对于很多考生来说也是一个难点。
在解答英语题目时，考生需要准确地理解题意，并给出合理的答案。
长理考研真题的答案通常会给出详细的解题方法和答案解释，这对于考生来说是非常有帮助的。
通过仔细研究长理考研真题答案，考生可以更好地理解英语题目的解法和答案的逻辑，提高解题的准确性和理解能力。
此外，我们还需要关注专业课科目的长理考研真题答案。
不同专业的考研科目有着不同的特点和难点，因此对于考生来说，研究长理考研真题的答案也是非常重要的。
通过仔细研究长理考研真题答案，考生可以更好地理解专业课题目的解法和答案的逻辑，提高解题的准确性和专业知识的掌握程度。
总结起来，长理考研真题答案对于考生来说具有重要的指导作用。
通过仔细研究长理考研真题答案，考生可以更好地理解题目的解法和答案的逻辑，提高解题的准确性和效率。
因此，在备考过程中，考生应该充分利用长理考研真题的答案，不断提高自己的解题能力和专业知识水平。
同时，考生还应该注重对答案的分析和总结，以便更好地应对考试中的各种题型和难点。
总之，长理考研真题答案对于考生来说是非常重要的备考资料。
通过仔细研究长理考研真题的答案，考生可以更好地理解题目的解法和答案的逻辑，提高解题的准确性和效率。
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长沙理工大学研究生考试试卷
课程名称矩阵论（B卷）拟题老师签名教研室主任签名
课程编号适应班级（年级）研一2009至2010 学年一学期考试.......................................................................................................................................
一、判断题（分）。
1、矩阵相似于对角矩阵，则此矩阵所有特征值的代数重数等于几何重数.......( )
2、若存在矩阵PC，使得A=PHP，则A是正定矩阵。
.................................( )
3、对任意矩阵，的秩与A的秩相同..............................................( )
4、上，两种矩阵范数不等价.....................................( )
5、，是一酉矩阵，则..............................................( )
6、设A ，(r>0),是A的非零奇异值，则............( )
7、矩阵级数收敛的充分必要条件是正项级数收敛，其中是上任意一种矩阵范数........................................................................................( )
8、任意矩阵都存在满秩分解，且分解是唯一的..................................( )
9、是Hermite矩阵，则对，，其中是A的最大特征值....( )
10、设，则上任一矩阵范数，均有。
.............................( )
二、求酉矩阵，使为对角矩阵，其中.(12分)
三、设，列向量，证明：矩阵范数与向量的2-范数相容. (12分)
四、已知A=，求. (12分)
五、已知矩阵A=,求A的QR分解。
(12分)
六、应用盖尔圆定理隔离A= 的特征值，并根据实矩阵特征值的性质改进所得的结果。
(12分)。