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Unit4ListeningTask4Mr.Smithisreportingtoalostcardtohisbank.Listentotheconversationandanswerthefollowingquestions.1.WhendidMr.Smithlosehiscard?2.Whatinformationisneededtoreportaloss?3.WherecanMr.Smithobtainanewcard?4.WhydoestheclerksaythatMr.Smithislucky?

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Unit4ListeningTask2Mr.Brownistalkingwithaclerkinabank.Listentotheconversationandanswerthefollowingquestions.1.HowmuchunusedRMBdoesMr.Brownhave?Hehas_____________yuan.2.Whycan'tMr.BrowntaketheunusedRMBbacktohishomecountry?Because_________________________.3.WhatistheexchangeratebetweenRMBandUSDinMr.Brown'smemo?It'soneUSdollarto_____________yuan.

电器按工作电压等级分为两种,低压电器用于交流电压()、直流电压以下()电路中;当电器工作在大于以上电路电压时,称为()。__、___、____。

接触器主要由()、()和()组成。__、___、____。

接触器按其主触头所控制主电路电流的种类可分为__、和___。

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