telephone课件
日期：2010-01-27 01:45
youmaylookitupinthetelephoned________2Thiskindoffoodwills__________youupafteryourillness3Pleaser________alltheletterstothefollowingaddressesirectorytrengthenedirect4Wehaveplentyofrainhere，Answerthefollowingquestions1Howwasonetelephoneconnectedwithanotherinthepast?2Howisonetelephoneconnectedwithanothertoday?BythickheavymetalwiresByverythinglasspipesandsatelliteelectricalsignalselectricalsignalsHowdoesatelephonework?Whydidpeoplehavetowindthehandlebeforemakingacall?Whatdidthetelephoneoperatordo?Whataresatellitesusedfor?AmericaChinaelectricalsignalselectricalsignalsWhatwasthewaytosendsignalsinthepast?metalwireslightsignalslightsignalsHowtosendsignalsnow?thinglasspipestoonoisy!notclear!veryclearelectricalsignalselectricalsignalsconferencecallingABCDEcallwaitingABCABBcredirectionFindsomewordstocompletethesentences:Ifyoudon’tknowthetelephonenumberofacertainunit，Itrainsf__________，
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