题目内容

主令电器应用广泛、种类繁多。按其作用可分为：（）、（）、（）、万能转换开关、主令控制器及其他主令电器()等。

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[音频]Unit4ListeningTask5Listentothepassagetwiceandfillintheblankswithwhatyouhear.Afewdaysago,IvandecidedtoaddsomemoneytohisbankaccountviaATM.Afterheput$74,theATMtookthemoneyandreturnedhimaslip.___,theamountontheslipwas$7,430,000.Hegotanotherslip—andstilltheamountwasthesame.SohedecidedtogotothebankandtellthemaboutthemistaketheATMhadmade.Ivanarrivedatthebankandtoldaclerkhisstory,alsoshowedaslip,buttheclerkwasnotinterestedinthesituation."_,buddy,"saidtheclerktothe7milliondollarsaccountholder."Comebackpleasesomeothertime,I'vegotalotofthingstodorightnow."Ivangotoffendedwithsucharesponse.HethenearestATMandstartedwithdrawingthecash.HewentfromoneATMtoanother_ofeachone.Heputallthemoneyinbigshoeboxesandafterwardstookallthoseboxestothatbankclerk.Hethrewtheboxesontheclerk'sdesk."What'sthis?"askedtheclerk."It'smoney.."Theclerkwasreallyshocked.Hecalledotherbankworkersandtheyallgotgreatlyamazedbywhattheywerepresented.Theytookthemoneyfromthecardholder,andtoldhim"thankyou"__________________.

其他常用机构有（）

A. 棘轮机构
B. 槽轮机构
C. 不完全齿轮机构
D. 万向铰链机构
E. 凸轮式间歇运动机构
F. 组合机构

棘轮机构由（）组成。

A. 摇杆
B. 棘爪
C. 棘轮
D. 止动爪
E. 弹簧
F. 机架
G. 轴

其它常用机构的运动是将主动件的（）运动，变成从动件的（）运动

A. 连续
B. 规律
C. 间歇
D. 不规律