机电工程专业英语(期末考试复习资料)

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1、一、Placea“T”beforesentencesthataretrueandan“F”beforethosethatarefalse(T)1、Awormgearissometimesusedinmachines,ithaslowfrictionthatcansaveconsiderablepower.蜗轮有时用在机器上，具有低的摩擦，可节省相当大的力。(T)2、Inacammechanism,whenthecamturnsthroughonemotioncycle,thefollowerexecutesaseries

2、ofeventconsistingofrises,dwellsandreturns.在一个凸轮机构中，当凸轮转过一个运动周期时，从动件执行一系列由上升、停留和返回的动作。(T)3、Integratedcircuitisbuiltonasemiconductorsubstrate,usuallyoneofmulti-crystalsilicon.集成电路是建立在一个半导体衬底，通常是多晶硅。(T)4、Krichhoff’svoltagelawstatesthatthesumofthepotentialdropsaround

3、aloopinacircuitmustbezero.Krichhoff电压定律指出，在电路中的回路的电位下降的总和必须为零。(F)5、Electronsandprotonsaresaidtohavethesamepositivecharges.电子和质子具有相反的电荷。(T)6、Ifasinusoidallyvaryingvoltagesourceisconnectedacrossthecapacitor,itcanbeshownthatthevoltageacrossthecapacitorlagsthecurrent

4、byinphase,meaningthatthevoltagepeaksoccur1/4ofanoscillationperiodlaterintimerelativetothecurrentpeaks.如果一个以正弦波形式随时间正负变化的电压源加在电容上，将会使电容电压在相位上滞后于电流，即该电压的峰值会比电流的峰值晚出现四分之一个周期的时间。(T)7、Theadvanceofwaterasapressuremediumtookadoublehitsneartheturnof20thcentury:oneistheel

5、ectricpowercontrolandtheotheristheoilhydrauliccontrolsystemHowever,theadvanceofwaterasapressuremediumtookadoublehitsneartheturnofthe20thcentury:electricalpowerofferedameansofaccuratecontrolandalargepowersupplyoverlongdistancesandin1906,thefirstoilhydraulicsystemw

6、asintrod.(F)8、AnON-delaytimerisenabledwhenitsrungisfalse.通电延迟定时器响应时，其梯级为真。(T)9、Waterhydraulicsisawhollynewtechnology.纯水液压传动技术是一种全新的技术。(F)10、Accelerationistherateofchangeofdisplacement.加速度是位移变化率。(F)11、Gearscanchangetherateofrotationofamachineryshaftbutcannotchange

7、rotarymotiontolinearmotion.齿轮的机械轴的旋转率的变化而不能回转运动转变为直线运动。(T)12、Krichhoff’scurrentlawstatesthatthesumofthecurrententeringandexistinganodemustbezero.(T)13、Integratedcircuitisbuiltonasemiconductorsubstrate,usuallyoneofmulti-crystalsilicon.(T)14、Thefirstintegratedcircu

8、itswerecreatedinthelate1950sinresponsetoademandfrommilitaryforminiaturizedelectronicstobeusedinmissilecontrolsystems.第一个集成电路是在50年代末创建的，以响应微型电子在军事导弹控制系统中使用的需求。(