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低压断路器是一种既有手动开关作用又能自动进行()、()、()、和()保护的

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低压隔离器也称刀开关,品种主要有低压刀开关、和()、()3种。

主令电器是在自动控制系统中()或()的电器,用来控制接触器、继电器或其他电器线圈,使电路(),从而达到控制生产机械的目的。

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。

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

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