高二satellites课件
日期：2010-01-06 01:20
Lesson54SatellitesByYangYuanyuanWhatwascarriedupintospaceonOct15th，itcanescapethepulloftheearth西昌卫星发射场卫星发射架3Whyaresatellitessoexpensive?Becauseithastobemadelightandithasexpensiveequipmentlikecameras，440km/h，eithernaturalorman-made，travelinginanorbitroundanotherobjectinspace2Whyisitpossibleforsatellitestogointospace?whenthespeedofarocketthatcarriesasatelliteupintospacereaches28，2003?ShenZhouⅤ神州五号Doyouknowhowmanytypesofsatellites?东方红一号风云一号气象卫星风云二号气象卫星海洋一号卫星实践1号卫星北斗导航卫星地球资源一号卫星ReadingComprehensionListentothetapeandthenanswerthefollowingquestions:1Howoftendothemoontravelroundtheearth?2Whatdoweathersatellitessendtoweatherstationsonearth?1What’sasatellite?2Whyisitpossiableforaman-madesatellitetogointospace?3Whyaresatellitessoexpensive?4Howdoseasatelliteproduceelectricity?Whatcansatellitessendbacktotheearth?6Whyisitnecessaryforbroadcastingsatellitesnottochangetheirpositions?ExercisesI(preparethequestions)1Whatisasatellite?Asatelliteisanobject，broadsu，
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