组装函授作业4答案

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附录-1综合练习答案-河北轨道运输职业技术学院函授教育

河北轨道运输职业技术学院函授教育课程作业年级：层次：专业名称：课程名称：作业序号：学号：姓名：第四章钢的热处理一、填空题1．热处理工艺过程由、和三个阶段组成。

2．整体热处理分为、、和等。

3．共析钢在等温转变过程中，其高温转变产物有：、以及。

4．贝氏体分为和两种。

5．常用的退火方法有：、和等。

6．根据淬火介质不同，淬火方法有：淬火、淬火、淬火和淬火等。

7．常用的淬火冷却介质有、等。

8．按回火温度范围可将回火分为回火、回火和回火三种。

9．化学热处理是由、和三个基本过程组成。

10．化学热处理包括、和等。

11．目前常用的渗氮方法主要有渗氮和渗氮两种。

二、单项选择题1．过冷奥氏体是温度下存在，尚未转变的奥氏体。

A．Ms； B. M f； C. A1。

2．为了改善高碳钢（W C＞0.6%）的切削加工性能，一般选择作为预备热处理。

A．正火； B. 淬火； C.退火；D．回火。

3．过共析钢的淬火加热温度应选择在，亚共析钢的淬火加热温度则应选择在。

A. Ac1+30℃～50℃；B．Ac cm以上；C．Ac3+30℃～50℃。

4．调质处理就是的热处理。

A．淬火+低温回火；B．淬火+中温回火；C．淬火+高温回火。

5．化学热处理与其它热处理方法的基本区别是。

A．加热温度；B．组织变化；C．改变表面化学成分。

6．零件渗碳后，一般需经处理，才能达到表面高硬度和高耐磨性目的。

A．淬火+低温回火；B．正火；C．调质。

三、判断题1．高碳钢可用正火代替退火，以改善其切削加工性。

( )2．淬火后的钢，随回火温度的提高，其强度和硬度也提高。

( )3．钢的最高淬火硬度，主要取决于钢中奥氏体的碳的质量分数。

( ) 4．钢的晶粒因过热而粗化时，就有变脆的倾向。

( )四、简答题1．指出Ac1、Ac3、Ac cm；Ar1、Ar3、Ar cm及A1、A3、A cm之间的关系。

2．控制奥氏体晶粒长大的措施有哪些？3．简述共析钢过冷奥氏体在A1～M f温度之间，不同温度等温时的转变产物及基本性能。

2024春《机电设备安装与调试》第四次形成性考核作业答案

机电设备安装与调试第四次形成考作业（大作业）
1.用四个开关控制一个照明灯。

（共50分）
控制要求：用4个开关控制一个照明灯，任何一个开关都可以控制照明灯的亮与灭。

（1）写出PLC的输入输出地址分配表。

（15分）
（2）画出PLC电路接线图。

（15分）
（3）编写PLC控制程序。

（20分）
答：（1）写出PLC的输入输出地址分配表。

（2）画出PLC电路接线图。

（3）编写PLC控制程序。

（20分）
2.三台电动机顺序启动，顺序停止。

（共50分）
控制要求：用一个按钮控制三台电动机，每按一次按钮启动一台电动机，全部启动后；每按一次按钮停止一台电动机，要求先启动的电动机先停止。

（1）写出PLC的输入输出地址分配表。

（15分）
（2）画出PLC电路接线图。

（15分）
（3）编写PLC控制程序。

（20分）
答：（1）写出PLC的输入输出地址分配表。

（2）画出PLC电路接线图。

（3）编写PLC控制程序。

西安石油大学函授《高等数学2》作业4

作业四1 / 24 单选题（3分）正确答案 B向量,,则( ).ABC-D-12 / 24 单选题（3分）正确答案 A函数在点处方向导数的最大值为( ). ABC0D3 / 24 单选题（3分）正确答案 C设为常数,则级数的敛散性是( ).A绝对收敛B条件收敛C发散D敛散性与有关4 / 24 单选题（3分）正确答案 B已知向量,则与同方向的单位向量为( ). ABCD5 / 24 单选题（3分）正确答案 A函数的定义域为( ).ABCD6 / 24 单选题（3分）正确答案 BABCD7 / 24 单选题（3分）正确答案 BABCD8 / 24 单选题（3分）正确答案 D方程组在空间表示( )A椭圆B圆C圆柱面D抛物线.9 / 24 单选题（3分）正确答案 A用待定系数法求微分方程的一个特解时,应设特解的形式为=( ) A.BC.D10 / 24 单选题（3分）正确答案 CABCD11 / 24 单选题（3分）正确答案 CABCD12 / 24 单选题（3分）正确答案 B设为平面在第一卦限的部分,则( ).ABCD 0E13 / 24 单选题（3分）正确答案 C函数在点处偏导数、连续是函数在该点全微分存在的( ).A充分必要条件B必要非充分条件C充分非必要条件D既非充分也非必要条件14 / 24 单选题（3分）正确答案 A下列级数中收敛的是( )。

ABCD15 / 24 单选题（3分）正确答案 B在下列向量中,与向量垂直的单位向量是( )。

ABCD16 / 24 单选题（3分）正确答案 D函数在点处的最大方向导数为( )。

A1B0C-1D√217 / 24 单选题（3分）正确答案 A方程表示的二次曲面是( )。

A柱面B双曲面C抛物面D 圆锥面18 / 24 单选题（3分）正确答案 BABC9DE19 / 24 单选题（3分）正确答案 C设向量与向量垂直,则( )。

A1B2C3D420 / 24 单选题（3分）正确答案 A二元函数在( )处是连续的。

国开机械制造基础形考任务四答案

国开机械制造基础形考任务四答案1.在装配过程中，需要测量基准、工序基准和定位基准来确保装配的准确性。

2.力源装置、传力机构和夹紧元件是装配过程中必不可少的标准部件。

3.完全和不完全的标准都存在于制造行业中。

4.尺寸精度、形状精度和位置精度是衡量零件质量的重要指标。

5.径向圆跳动和轴向窜动是衡量旋转零件质量的重要指标。

6.硬度和塑性是衡量金属材料性能的重要指标。

7.制造过程可以分为粗加工阶段、半精加工阶段和精加工阶段。

8.计算法、经验估计法和查表修正法是确定零件尺寸的常用方法。

9.对于高精度的零件，需要采用高精度的加工设备和工艺。

10.对于大批量生产的零件，需要采用自动化生产线来提高生产效率和质量。

11.在制造过程中，可以忽略零件的表面质量。

12.在制造过程中，需要考虑材料的热处理和表面处理对零件性能的影响。

13.机加工和铸造是制造零件的常用方法。

14.零件的质量只与材料有关，与制造工艺无关。

15.在制造过程中，需要采用合适的测量工具来确保零件尺寸的准确性。

16.在制造过程中，可以忽略零件的形状和位置误差。

17.在制造过程中，需要采用合适的材料来满足零件的性能要求。

18.在制造过程中，需要考虑零件的使用环境对其性能的影响。

19.零件的尺寸精度和形状精度是相互独立的。

20.在制造过程中，需要考虑零件的装配性和可靠性。

21.在制造过程中，需要采用合适的工艺来确保零件表面质量。

22.零件的尺寸精度和位置精度是相互独立的。

23.在制造过程中，可以忽略零件的材料特性对其性能的影响。

24.在制造过程中，需要采用合适的加工工艺来确保零件尺寸的稳定性。

25.在制造过程中，需要采用合适的装配工艺来确保零件的装配精度。

26.零件的尺寸精度和表面质量是相互独立的。

27.在制造过程中，需要考虑零件的材料选择对其性能的影响。

28.在制造过程中，需要采用合适的检测手段来确保零件质量。

29.零件的尺寸精度和位置精度是可以相互转化的。

国开机械制造基础形考任务四答案

标准答案1：装配基准测量基准工序基准定位基准标准答案2：力源装置传力机构夹紧元件标准答案3：完全不完全标准答案4：尺寸精度形状精度位置精度标准答案5：径向圆跳动轴向窜动标准答案6：硬度塑性标准答案7：粗加工阶段半精加工阶段精加工阶段标准答案8：计算法经验估计法查表修正法标准答案9：对标准答案10：对标准答案11：错标准答案12：对标准答案13：对标准答案14：错标准答案15：对标准答案16：错标准答案17：对标准答案18：对标准答案19：错标准答案20：对标准答案21：对标准答案22：错标准答案23：错标准答案24：对标准答案25：对标准答案26：错标准答案27：对标准答案28：对标准答案29：错标准答案30：错标准答案31：错标准答案32：解：1）画尺寸链，确定封闭环和增、减环如图所示，250+0.19为封闭环，600-0.1为增环，L为减环。

2）求L根据：25=60－L 则：L=60－25=35（mm）3）求L的极限偏差ES L、 EI L根据：0.19 = 0－EI L则：EI L = 0－0.19 = －0.19（mm）根据：0 = －0.1－ ES L则：ES L = －0.10（mm）-0.10即：L=35 （mm）-0.19标准答案33：解：1.画尺寸链，确定封闭环和增、减环如图所示，为封闭环，A、为增环，为减环。

2.求A根据：10= A + 30－60则：A = 60 + 10－30 = 40（mm）3.求L的极限偏差、根据：0.20 = + 0.06 －（－0.06）则：= 0.20－0.06－0.06 = 0.08（mm）根据：0 = + 0 －0.06 则： = 0.06（mm）即：A = （mm）标准答案34：解：1）画尺寸链，确定封闭环和增、减环。

如图所示，为封闭环，A、为增环，、为减环。

2）求A根据：26 =（50 + A）－（10 + 20）则：A = 26 + 10 + 20－50 = 6（mm）3）求A的极限偏差、。

汽车维修工四级模拟试卷四答案

汽车维修工四级模拟试卷四答案模拟试卷四一、判断问题1、为了用简单明了的图形表示复杂的电气回路，一般使用符合表示构成回路的元件。

（√）2、齐纳二极管是一种特殊的二极管。

（√）3、晶体管的作用就是开关作用。

（×）4、蓄电池的作用就是提供电能。

（×）5.电池充放电是将化学能转化为电能，将电能转化为化学能的过程。

(√)6.电池具有低速放电和高速放电的特点。

(√) 7.提高点火性能的方法是使用贵金属作为电极。

（×） 8. 电压调节器是为了保持发电机输出电压的稳定。

(√) 9.起动器为直流电机。

（×） 10. 照明系统的功能是照明。

（×） 11. 非接触式点火可提高发动机转速。

(√) 12.二级保养前，发动机的检测和诊断项目为点火系统。

（×） 13. 汽油机和柴油机的气缸压力表相同。

（×） 14. 二次维修车辆的废气排放应符合排放标准。

(√) 15.对传动系统进行不解体检查，以确定额外的操作项目。

(√) 16.离合器的工作状态要求无打滑、抖动、完全分离、无异常噪音。

(√) 17.测量蓄电池电解液的比重。

(√) 18.起动机驱动发动机运转。

它运行速度快但无法启动，这是启动困难的现象之一。

(√) 19.曲柄连杆机构上的力仅为气体力和惯性力。

（×） 20. 为了密封缸套和缸体之间，无论是干的还是湿的，缸套压入缸体后都应进行压缩缸套顶面与气缸体上平面平齐。

（×）21、气门座圈与气门座孔之间一般采用过渡配合。

（×）22、汽油在气缸内燃烧前必须把汽油喷散成雾状，然后自燃。

（×）23、现代汽油发动机采用电动汽油泵。

（√）24、电动燃油泵不工作说明燃油泵损坏。

（×）25、混合气浓度由喷油嘴决定。

（×）26、现代车辆已取消了曲轴箱通风阀（pcv）。

（×）27、水泵叶轮与水泵轴一般被做成一体。

2 英语4(本)

泰医函授继续教育考试英语4（本）2一、单选题(红色是答案)1.Remember, nothing hurts concentration ___3 _ reading too slowly. (2分)A. rather thanB. as well asC. more thanD. instead of2.On each job he avoided _____4__ people know who he was.(2分)A. letB. to letC. be letD. letting3.Is the city much different from ___3___ it was ten years ago?(2分)A. thatB. whichC. whatD. where页脚内容14.Many boys enjoy ___4__ football, basketball or baseball.(2分)A. playB. to playC. playedD. playing5.The news you told me the other day wants yet to be ____3____.(2分)A. finnedB. conformedC. confirmedD. informed6.Having been working in this school for over 20 years, Mr. Brown is ______ an inexperienced teacher.(2分)A. by no meansB. by any meansC. by all meansD. by every means7.Sound was used _____ the ocean.(2分)A. to measureB. to measuringC. by measuring页脚内容2D. to be measured8.We’re usually too tired ____ much socializing during the week.(2分)A. to doB. doingC. in doingD. to doing9.Human beings are superior to animals______ they can use language as a tool to communicate.(2分)A. in whichB. for whichC. in thatD. for that10.Mobile Phones are proved to with flight instruments and have a negative effect on flight safety.(2分)A. interruptB. interfereC. troubleD. disturb11.I could hardly ______ the ship in the distance.(2分)A. look outB. make out页脚内容3C. make upD. see through12.From what has been discussed, we may draw the ______ that its advantages are far greater than its disadvantages.(2分)A. answerB. attentionC. solutionD. conclusion13.Man must stop __________ the earth’s atmosphere.(2分)A. fillingB. emittingC. pollutingD. wasting14.The stronger the motivation, _____ a person will learn a foreign language.(2分)A. the more quicklyB. more quicklyC. the quicklierD. and the more quickly15.The film ________, she left her seat so quietly that no one complained that her leaving disturbed their watching the film．(2分)页脚内容4A. beganB. beginningC. having begunD. begun16._____ my opinion, the movie lacks content.(2分)A. InB. OnC. UponD. To17.Her father can afford a splendid wedding, as he is loaded _____ money.(2分)A. withB. underC. inD. at18.The harder the shrub is to grow, ______.(2分)A. the higher price it isB. the higher price it would haveC. the higher price isD. the higher the price is页脚内容519.I'm afraid ________ nothing I can do about it.(2分)A. there isB. it isC. this isD. that is20.Motor vehicles are prohibited _______ driving in the town center.(2分)A. inB. out ofC. fromD. with21.The question set by the teacher was so difficult ______ the pupils did not know how to tackle it.(2分)A. whatB. thatC. howD. whether22.John Smith, being a diligent student, never refuses to the responsibilities that are assigned to him. (2分)A. take inB. take onC. take down页脚内容6D. take off23.At first I was worried about the employment prospect. Four years of study later, I've realized I ______.(2分)A. didn't need to worryB. mustn't have worriedC. needn't have worriedD. couldn't have worried24.Do you remember that our speed is 60 mph on the highway and Big Brother is watching you through his camera in some areas.A. controlB. conditionC. permissionD. limit25.In addition, teaching staff is willing_____ extra help if a student needs.(2分)A. to providingB. to provideC. providedD. provided26.All electrical goods sold in our shop will be ______ for one year.(2分)A. guaranteed页脚内容7B. protectedC. ensuredD. granted是否存疑27.I will bring my tennis things along in case we ______ time for a game tomorrow.(2分)A. shall haveB. will haveC. haveD. are going to have28.I'd rather ____ those confidential documents with you.(2分)A. that you didn't takeB. your not takingC. that you will not takeD. you do not take29.His parents saw him ______ the winner’s medal.(2分)A. toawardB. to be awardedC. awardedD. being awarded30.To much ____ to sunlight can cause skin burns，cancer or other damage to the body．(2分)页脚内容8A. exposureB. exhibitionC. disclosureD. contact二、阅读理解1.In my long life I have seen many changes in out habits and customs and conditions in general. I think that you might be interested if I told you some of them.The world I entered at the age of eighteen when I became a medical student was a world that knew nothing of such advanced things as planes, films, radios or telephones. It was a very cheap world. Prices were stable. When I entered St.Thomas’ Hospital I rent a set of rooms in Vincent Square for which I paid 18 shillings(先令) a week. My landlady provided me with a very good breakfast before I went to the hospital and a dinner when I came back at half past six.I only had to pay for the breakfasts and dinners twelve shillings a week. For four-pence I lunched at St.Thomas’ on bread and butter and a glass of milk. I was able to live there very well, pay my fees, buy my necessary instruments, clothe myself, and have a lot of fun on fourteen pounds a month. And I could always pawn(当掉)my microscope for three pounds.I spent five years at St.Thomas’ Hospital. I was a bad student, for my heart, as you might have guessed, was not in it.I wanted, I had always wanted, to be a writer, and in the evenings, after my dinner, I wrote and read. Before long, I wrote a novel call ed“Liza of Lambeth”, which I sent to a publisher and was accepted. It came out during my last year at the hospital and it was successful. It was of course an accident, but I did not know that. I felt I could afford to give up medicine and make writing my profession; so, three days after I graduated from the school of medicine, I left for Spain to write another book. I did not realize, at that time, that I was taking a great risk.页脚内容9(10分)(1)This text is a talk given by the writer when_______.(2分)A. he was 18.B. his first novel was published.C. he graduated from the school of medicine.D. he was at an old age.(2)The author graduated from the school of medicine when he was_______.(2分)A. 18B. 28C. 23D. 30(3)“And I could always pawn my microscope for three pounds.” means the writer could always______.(2分)A. exchange his microscope for three pounds.B. borrow his microscope and pays three pounds.C. have his microscope repaired with three pounds.D. lend his microscope for three pounds(4)In p aragraph two, this sentence “I was able to live there very well, pay my fees, buy my necessary instruments, clothe myself…”, the word “clothe” means “________” .(2分)A. wear clothesB. make clothes for页脚内容10C. wash clothes forD. buy clothes for(5)The writer wanted to be a writer because________.(2分)A. he liked to take risks.B. he found it easier to make a living by writing.C. he was interested in writing.D. he could not study medicine well.2.David, my next-door neighbor, has two young kids aged five and seven. One day he was teaching his seven-year-old son Kelly how to push the lawn mower around the yard. As he was teaching him to turn the mower around at the end of the lawn, his wife, Jane, called to him to ask a question. As David turned to answer the question, Kelly pushed the lawn mower right through the flower bed at the edge of the lawn, leaving a two-foot wide path leveled to the ground.When David turned back around and saw what had happed, he began to lose control. David had spent a lot of time and effort making those flower beds the envy of the neighborhood. As he began to raise his voice to his son, Jane walked quickly over to him, put her hands on his husband’s shoulder and said, “David, please remember…we’re raising children, not flower s!”Jane reminded me how important it is as a parent to remember our priorities. Kids and their self-esteem are more important than any physical objects they might break or destroy. The window pane broken by a football, a desk lamp knocked over by a careless child, or a plate dropped in the kitchen is already broken. The flowers are already页脚内容11dead. We must remember not to add the destruction by breaking a child’s spirit and deadening his sense of liveliness.(10分)(1)What did David teach Kelly to do one day?(2分)A. How to water flowers.B. How to operate a mower.C. How to clean the yard.D. How to take care of the lawn.(2)What did Jane mean by saying “we’re raising children, not flowers”?(2分)A. We don’t have enough time to raise flowers.B. Children are of greater importance than flowers.C. We like flowers better than children.D. Flowers are raised for children.(3)What should be considered as priorities by parents?(2分)A. Correcting children’s bad behaviors.B. Always forgiving children for their mistakes.C. Asking children not to break physical objects.D. Bearing children’s self-esteem in mind.(4)What can be inferred from the last paragraph?(2分)A. Children nowadays are very careless.页脚内容12B. It’s no use crying over spilt milk.C. Destruction of physical objects means nothing.D. Not every child has sense of liveliness.(5)Which of the following words can be used to best describe the author’s attitude towards Jane?(2分)A. Critical.B. Indifferent.C. Approving.D. Negative.3.How men first learnt to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs called letters, which could be combined to represent those sounds, and which could be written down. Those sounds, whether spoken, or written in letters, we call words.The power of words, then, lies in their associations -- the things they bring up before our minds. Words become filled with meaning for us by experience, and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increases.Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming(迷人的) and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which页脚内容13by their position and association can move men to tears. We should therefore learn to choose our words carefully and use them accurately, or they will make our speech silly and vulgar(粗俗的).(10分)(1)One of the reasons why men invented certain sounds to express thought and actions was that ________.(2分)A. they could agree upon certain signsB. they could write them downC. they could combine themD. they could communicate with each other(2)By “association”, the author means _________.(2分)A. a special qualityB. a joining of ideas and experience in the mindC. an appearance which is puzzlingD. a strange feature(3)Which of the following statements is true?(2分)A. The more we read and learn, the more confused we will be.B. The more we read and learn, the more ignorant we are.C. The more we read and learn, the more learned we are.D. The more we read and learn, the more snobbish we become.(4)In expressing their thoughts, great writers are able _________.(2分)A. to move our actions页脚内容14B. to puzzle our feelingsC. to move men to tearsD. to confound the readers(5)The word “convey”(in Para. 3) m eans_________.(2分)A. deliverB. sellC. reportD. talk4.How much living space does a person need? What happens when his space requirements are not adequately met? Sociologists and psychologist are conducting experiments on rats to try to determine the effect of overcrowded conditions on man. Recent studies have shown that the behavior of rats is greatly affected by space. If rats have adequate living space, they eat well, sleep well, and reproduce well. However, if their living conditions become too crowded, their behavior patterns and even their health perceptibly change. They cannot sleep and eat well, and signs of fear and tension become obvious. The more crowded they are, the more they tend to bite each other and even kill each other. Thus for rats, population and violence are directly related. Is this a natural law for human society as well? Is adequate space not only desirable, but also essential for human survival?(10分)(1)This passage is mainly about ________.(2分)A. living space and behaviorB. population and living conditionsC. interesting experiments on ratsD. a natural law for human society(2)What is the purpose of the experiments described in the passage?(2分)页脚内容15A. To determine how much living space a rat needs.B. To see what happens when rats live in a limited space.C. To know the likely effects of inadequate living space on human beings.D. To find out the relationship between population and living conditions(3)Which is NOT a result of being too crowded for rats?(2分)A. They become nervous.B. They cannot get enough rest.C. They eat less.D. They become less active.(4)The passage suggests that overcrowded conditions ________.(2分)A. are directly related with populationB. may cause an increase in violenceC. may lead to high birth rateD. may bring about pollution problems(5)The author seems to imply that ________.(2分)A. human society is very similar to that of ratsB. birth control is essential for a better lifeC. efforts should be made to improve living conditionsD. rats are not social animal页脚内容16泰医函授继续教育考试英语4（本）3一、单选题1.he tried to pass the driving test, he still failed the second time.(2分)A. As hardB. Though hardC. Hard asD. No matter hard2.—What do you want to do next? We have half an hour until the basketball game．—_______.Whatever you want to do is fine with me．(2分)A. It just dependsB. It's up to youC. Glad to hear thatD. All right页脚内容173.On each job he avoided _______ people know who he was.(2分)A. letB. to letC. be letD. letting4.They discussed the problem three or four times, but could come to no _____________.(2分)A. endB. conclusionC. resultD. judgment5.I'm afraid ________ nothing I can do about it.(2分)A. there isB. it isC. this isD. that is6.Having been working in this school for over 20 years, Mr. Brown is ______ an inexperienced teacher.(2分)A. by no meansB. by any meansC. by all meansD. by every means页脚内容187.The question set by the teacher was so difficult ______ the pupils did not know how to tackle it.(2分)A. whatB. thatC. howD. whether8.His parents saw him ______ the winner’s medal.(2分)A. toawardB. to be awardedC. awardedD. being awarded9.The team didn’t expect to win;_________, they were disappointed at their heavy defeat.(2分)A. moreoverB. thereforeC. neverthelessD. so that10.The news you told me the other day wants yet to be ________.(2分)A. finnedB. conformedC. confirmed页脚内容19D. informed11.To much ____ to sunlight can cause skin burns，cancer or other damage to the body．(2分)A. exposureB. exhibitionC. disclosureD. contact12.Man must stop __________ the earth’s atmosphere.(2分)A. fillingB. emittingC. pollutingD. wasting13.All electrical goods sold in our shop will be ______ for one year.(2分)A. guaranteedB. protectedC. ensuredD. granted14.Is the city much different from ______ it was ten years ago?(2分)A. thatB. whichC. what页脚内容20D. where15.Do you remember that our speed is 60 mph on the highway and Big Brother is watching you through his camera in some areas.(2分)A. controlB. conditionC. permissionD. limit16.Her father can afford a splendid wedding, as he is loaded _____ money.(2分)A. withB. underC. inD. at17.The film ________, she left her seat so quietly that no one complained that her leaving disturbed their watching the film．(2分)A. beganB. beginningC. having begunD. begun18.Remember, nothing hurts concentration ___ _ reading too slowly.页脚内容21(2分)A. rather thanB. as well asC. more thanD. instead of19.Only when I left my parents for Beijing ______ how much I loved them.(2分)A. I realizedB. I had realizedC. did I realizeD. had I realized20.That novel is said into over 12 languages by the end of last year.(2分)A. to be translatedB. being translatedC. having been translatedD. to have been translated21.I was not ______ by his many arguments, so finally we agreed to differ.(2分)A. convictedB. confirmedC. concerned页脚内容22D. convinced22.Motor vehicles are prohibited _______ driving in the town center.(2分)A. inB. out ofC. fromD. with23.I'd rather ____ those confidential documents with you.(2分)A. that you didn't takeB. your not takingC. that you will not takeD. you do not take24.At first I was worried about the employment prospect. Four years of study later, I've realized I ______.(2分)A. didn't need to worryB. mustn't have worriedC. needn't have worriedD. couldn't have worried25.I will bring my tennis things along in case we ______ time for a game tomorrow.(2分)A. shall haveB. will haveC. have页脚内容23D. are going to have26.Many boys enjoy _____ football, basketball or baseball.(2分)A. playB. to playC. playedD. playing27.The harder the shrub is to grow, ______.(2分)A. the higher price it isB. the higher price it would haveC. the higher price isD. the higher the price is28._____ my opinion, the movie lacks content.(2分)A. InB. OnC. UponD. To29.Mobile Phones are proved to with flight instruments and have a negative effect on flight safety. (2分)页脚内容24A. interruptB. interfereC. troubleD. disturb30.______ his great achievements in chemistry, he was considered as one of the most outstanding scientists of the century.(2分)A. In terms ofB. On behalf ofC. On the basis ofD. in the form of二、阅读理解1.David, my next-door neighbor, has two young kids aged five and seven. One day he was teaching his seven-year-old son Kelly how to push the lawn mower around the yard. As he was teaching him to turn the mower around at the end of the lawn, his wife, Jane, called to him to ask a question. As David turned to answer the question, Kelly pushed the lawn mower right through the flower bed at the edge of the lawn, leaving a two-foot wide path leveled to the ground.When David turned back around and saw what had happed, he began to lose control. David had spent a lot of time and effort making those flower beds the envy of the neighborhood. As he began to raise his voice to his son, Jane walked quickly over to him, put her hands on his husband’s shoulder and said, “David, please remember…we’re raising children, not flowers!”页脚内容25Jane reminded me how important it is as a parent to remember our priorities. Kids and their self-esteem are more important than any physical objects they might break or destroy. The window pane broken by a football, a desk lamp knocked over by a careless child, or a plate dropped in the kitchen is already broken. The flowers are already dead. We must remember not to add the destruction by breaking a child’s spirit and deadening his sense of liveliness.(10分)(1)What did David teach Kelly to do one day?(2分)A. How to water flowers.B. How to operate a mower.C. How to clean the yard.D. How to take care of the lawn.(2)What did Jane mean by saying “we’re raising children, not flowers”?(2分)A. We don’t have enough time to raise flowers.B. Children are of greater importance than flowers.C. We like flowers better than children.D. Flowers are raised for children.(3)What should be considered as priorities by parents?(2分)A. Correcting children’s bad behaviors.B. Always forgiving children for their mistakes.C. Asking children not to break physical objects.D. Bearing children’s self-esteem in mind.页脚内容26(4)What can be inferred from the last paragraph?(2分)A. Children nowadays are very careless.B. It’s no use crying over spilt milk.C. Destruction of physical objects means nothing.D. Not every child has sense of liveliness.(5)Which of the following words can be used to best describe the author’s attitude towards Jane?(2分)A. Critical.B. Indifferent.C. Approving.D. Negative.2.How men first learnt to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs called letters, which could be combined to represent those sounds, and which could be written down. Those sounds, whether spoken, or written in letters, we call words.The power of words, then, lies in their associations -- the things they bring up before our minds. Words become filled with meaning for us by experience, and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increases.页脚内容27Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming(迷人的) and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should therefore learn to choose our words carefully and use them accurately, or they will make our speech silly and vulgar(粗俗的).(10分)(1)One of the reasons why men invented certain sounds to express thought and actions was that ________.(2分)A. they could agree upon certain signsB. they could write them downC. they could combine themD. they could communicate with each other(2)By “association”, the author means _________.(2分)A. a special qualityB. a joining of ideas and experience in the mindC. an appearance which is puzzlingD. a strange feature(3)Which of the following statements is true?(2分)A. The more we read and learn, the more confused we will be.B. The more we read and learn, the more ignorant we are.C. The more we read and learn, the more learned we are.D. The more we read and learn, the more snobbish we become.页脚内容28(4)In expressing their thoughts, great writers are able _________.(2分)A. to move our actionsB. to puzzle our feelingsC. to move men to tearsD. to confound the readers(5)The word “convey”(in Para. 3) means_________.(2分)A. deliverB. sellC. reportD. talk3.In my long life I have seen many changes in out habits and customs and conditions in general. I think that you might be interested if I told you some of them.The world I entered at the age of eighteen when I became a medical student was a world that knew nothing of such advanced things as planes, films, radios or telephones. It was a very cheap world. Prices were stable. When I entered St.Thomas’Hospital I rent a set of rooms in Vincent Square for which I paid 18 shillings(先令) a week. My landlady provided me with a very good breakfast before I went to the hospital and a dinner when I came back at half past six.I only had to pay for the breakfasts and dinners twelve shillings a week. For four-pence I lunched at St.Thomas’on bread and butter and a glass of milk. I was able to live there very well, pay my fees, buy my necessary instruments, clothe myself, and have a lot of fun on fourteen pounds a month. And I could always pawn(当掉)my microscope for three pounds.页脚内容29I spent five years at St.Thomas’Hospital. I was a bad student, for my heart, as you might have guessed, was not in it. I wanted, I had always wanted, to be a writer, and in the evenings, after my dinner, I wrote and read. Before long, I wrote a novel called“Liza of Lambeth”, which I sent to a publisher and was accepted. It came out during my last year at the hospital and it was successful. It was of course an accident, but I did not know that. I felt I could afford to give up medicine and make writing my profession; so, three days after I graduated from the school of medicine, I left for Spain to write another book. I did not realize, at that time, that I was taking a great risk.(10分)(1)This text is a talk given by the writer when_______.(2分)A. he was 18.B. his first novel was published.C. he graduated from the school of medicine.D. he was at an old age.(2)The author graduated from the school of medicine when he was_______.(2分)A. 18B. 28C. 23D. 30(3)“And I could always pawn my microscope for three pounds.”means the writer could always______.(2分)A. exchange his microscope for three pounds.B. borrow his microscope and pays three pounds.C. have his microscope repaired with three pounds.页脚内容30D. lend his microscope for three pounds(4)In paragraph two, this sentence “I was able to live there very well, pay my fees, buy my necessary instruments, clothe myself…”, the word “clothe”means “________” .(2分)A. wear clothesB. make clothes forC. wash clothes forD. buy clothes for(5)The writer wanted to be a writer because________.(2分)A. he liked to take risks.B. he found it easier to make a living by writing.C. he was interested in writing.D. he could not study medicine well.4.The United States is full of automobiles. There are still many families without cars, but some families have two or even more. However, cars are used for more than pleasure. They are a necessary part of life.Cars are used for business. They are driven to offices and factories by workers who have no other way to get to their jobs. When salesmen are sent to different parts of the city, they have to drive in order to carry their products. Farmers have to drive into the city in order to get supplies.Sometimes small children must be driven to school. In some cities school buses are provided only when children live more than a mile from the school. When the children are too young to walk that far, their mothers take turns driving页脚内容31them to school. One mother drives on Monday, taking her own children and the neighbors’children as well. Another mother drives on Tuesday, another on Wednesday, and so on. This is called forming a car pool. Men also form car pools, with three or four men taking turns driving to the place where they all work.More car pools should be formed in order to put fewer automobiles on the road and to use less gasoline. Parking is a great problem, and so is the traffic in and around cities. Too many cars are being driven. Something will have to be done about the use of cars.(10分)(1)Which is NOT true according to the passage?(2分)A. Each American family has got at least one car.B. Some American families have got more than one car.C. Cars are very common in the United States.D. Americans do not use cars for pleasure only.(2)According to the passage, children must be taken to school by car when ________.(2分)A. their homes are over one mile away from their schoolB. there are no school buses available and the school is too far away for themC. there are a number of children in the neighborhood whose families have carsD. the children are too young to walk to school every morning(3)Which people are forming a car pool?(2分)A. Three or four people who drive in turns to the office or the factory where they all work.B. A woman who takes her own children and her neighbors’children to school by car.页脚内容32。

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玉田函授站成人教育作业4
层次专科年级16计算机专业计算机应用科目《计算机组装与维护》姓名学号学期2017年第二学期分数任课教师签字：
一、选择题
1、存放在（D ）中的数据不能够被改写，断电以后数据也不会丢失。

A、随机存储器
B、内部存储器
C、外部存储器
D、只读存储器
2、现在（A ）显卡已经成为了个人计算机的基本配置和市场主流。

A、AGP
B、PCI
C、ISA
D、以上都不对
3、硬盘中信息记录介质被称为（B ）。

A、磁道
B、盘片
C、扇区
D、磁盘
4、在使用小键盘时，通过（A ）键，可以在光标和数字功能之间切换。

A、Num Lock
B、Tab
C、Caps Lock
D、Shift
5、（ B）决定了计算机可以支持的内存数量、种类、引脚数目。

A、南桥芯片组
B、北桥芯片组
C、内存芯片
D、内存颗粒
二、名词解释
1、总线扩展槽：扩展槽又称插槽，它是总线的延伸，也是物理总线的物理体现，在其上面可以插入任意的标准配件。

2、刷新频率：指影像在显示器上更新的速度，即影像每秒在屏幕上出现的帧数，其单位为Hz。

3、像素点距：指屏幕上两相邻象素点的距离点距离越小，显示器显示图形越清晰，点距离越小，意味着单位显示区内可显示更多的像点．
4、硬件系统：包括主机、输入输出设备、存储设备和功能卡组成。

整个硬件系统采用总线结构，各部分之间通过总线相连，组成一个有机整体。

5、超频：是指让脑的硬件在高于标准频率的环境下工作，一般包括对CPU、显卡、内存的超频。

三、简答题
1、硬盘的硬件维护包括哪些方面？
答：1、硬盘在工作时，不应直接按电源开关进行关机，突然断电，可能会造成硬盘数据丢失，甚至会造成磁盘损坏等严重后果。

2、不要在高温、过度潮湿、强磁场的环境中使用硬盘。

3、使用硬盘时要避免振动。

4、硬盘要防尘埃。

2、简述对硬盘进行磁盘清理的方法。

答：1、在资源管理器中选中要检查的分区，点击鼠标右键，选择“属性”；
2、在“属性”对话框里，选择“工具”；
3、选择第一项可以查错，选择第三项可以整理磁盘碎片，提高硬盘的使用率。

3、简述计算机病毒对计算机系统可能产生的影响。

答：1、减慢程序运行速度；
2、增加文件的长度；
3、出现新的奇怪的文件；
4、降低可以使用的内存总数；
5、发出奇怪的声音或者图像；
6、删除计算机中的文件；
7、破坏硬盘甚至BIOS。

4、为了避免感染计算机病毒，在平时的使用中要注意哪些问题？
答：1、专机专用；
2、经常进行系统备份；
3、不要使用盗版软件；
4、控制软盘使用，使用软盘前要杀毒；
5、经常杀毒，安装杀毒软件
5、如何通过维护和保养来减少光盘驱动器故障的发生？
答：在平时的使用中要注意防震、防尘；保持光驱水平放置；不要随意拆洗光盘驱动器；操作时要轻；不用时及时将盘片取出；不要使用质量差的光盘；减少使用时间；注意散热；另外还要规范操作。

6、为了避免感染计算机病毒，在平时的使用中要注意哪些问题？
答：1、专机专用；
2、经常进行系统备份；
3、不要使用盗版软件；
4、控制软盘使用，使用软盘前要杀毒；
5、经常杀毒，安装杀毒软件。

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国开 机械制造基础 形考任务四答案

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