机电一体化系统中，滚珠丝杆属于（）。A.机构B.执行元件C.动力源D.传感器

机电一体化系统中，直流电机属于（）。A.机构B.执行元件C.动力源D.传感器

齿轮传动的总等效惯量与传动级数()A.有关B.无关C.在一定级数内有关D.在一定级数内无关

PWM指的是（）。A.机器人B.计算机集成系统C.脉宽调制D.可编程控制器

以下接口属于无源接口的有（）。A.导线B.进给丝杠C.A/D转换器D.I/O接口

机电一体化系统（产品）开发的类型A开发性设计B适应性设计C变参数设计D互换性设计

机电一体化的高性能化一般包含A高速化B高精度C高效率D高可靠性

抑制干扰的措施很多，主要包括A屏蔽B隔离C滤波D接地和软件处理等方法

属于间歇机构的是（）。A.凸轮机构B.槽轮机构C.齿轮机构D.棘轮机构

齿轮各级传动比的分配原则（）A重量最轻B输出轴误差最小C转动惯量最小D随机原则

滚珠丝杠副的支承方式有（）A单推-单推式B双推-双推式C双推-简支式D双推-自由式

机械系统由（）A电动机B传动与导向装置C执行装置D控制装置组成。

滚珠丝杠常用的调整预紧方法有()A垫片调隙式B螺纹调隙式C齿差调隙式D随机调整式

11．昨日はだれも（　　　　　）。

PassageThreeQuestions11to15arebasedonthefollowingpassage.Imagineyouenteracarwithnosteeringwheel,nobrakeoracceleratorpedals(踏板).Underavoice-activatedcommand,yousayanaddress“Thefastestroutewilltakeus15.3minutes.ShouldItakeit?”Yousay“yes”andyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoissitbackandrelax.Howweirdwoulditbeif,onedayinthefuture,everyonehadsuchacar?Nocrazydiving,noinsults,nocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhand,imaginethecostsavingsforlocalpoliceenforcementandtownbudgetswithoutallthosespeedingandparkingtickets.Anewtechnologyhasthepotentialtochangemodernsocietyinradicalways.There’snoquestionthatself-drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddrop:some94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually-orphysically-impairedpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectric,self-drivingcarswoulddrasticallyreducepollutionlevelsanddependencyonnon-renewablefuels.Roadswouldbequieter,peoplesafer.Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirlivelihoods.AccordingtotheU.S.DepartmentofLabor,inMay2015therewere505,560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself-drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforce,manyofwhomwillbedisplacedbythenewtechnology.Thisissimilartowhat’shappeninginthecoalandoilindustries,asituationthatfuelsmuchofthecurrentpoliticaldiscontentinthiscountry.Newtechnologieswill,andshould,bedeveloped.Thisishowsocietymovesforward.However,progresscan’tbeone-sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsidertheethicalconsequencesofthesepotentialchangestobuildabetterfutureforall.11.Whatwouldbetheimpactoftheextensiveuseofdriverlesscars?