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来自梅春晖的问题

  Imaginethesituation.Youaredrivingalongadesertoronamountain.Youhavenoideawhereyouare.Youpassedthelasthousetwohoursago.Thenyourcarbreaksdown.Itisnightanditiscold.Youhavenomobilephone.Whatdoyoudo?Well

   

  

  Imaginethesituation.Youaredrivingalongadesertoronamountain.Youhavenoideawhereyouare.Youpassedthelasthousetwohoursago.Thenyourcarbreaksdown.Itisnightanditiscold.Youhavenomobilephone.Whatdoyoudo?WellnexttimetakeaGPSwithyou.Thisinventionmaybeabletohelpyou.Itisadevice(装置)whichusessatellites(卫星)tofindtheuser’sposition(位置).Itcanfindyourpositiontowithin20metres.AGPScannotstartyourcarbutatleastyouwillknowwhereyouare.

  GPSwhichmeansGlobalPositioningSystemisasmallradioreceiver.Itlookslikeamobilephone.Itissometimesputintoawatchoratelephone.WealsofindGPSdevicesincarsplanesorboats.Someofthesedeviceshaveelectronicmapssoyouknowwhereyouare.Forexampleinacitytheycantellyouthenameofthestreet.

  TherearethreepartstotheGlobalPositioningSystem.Thefirstpartisthereceiver.Youcanholditinyourhandorhaveitfixedintoyourcarplaneetc.Thesecondpartisagroupofsatellitesorbiting(环绕…运行)theEarth.Thereceivercontactsatleastfourofthesatellitesandcalculatesitsposition.Thethirdpartofthesystemisanetworkofgroundstations.Theyareallovertheworld.Theycontrolthesatellitesandmakesuretheyareworkingwell.

  SomepeoplethinkthatinthefuturetheGPSwillbeascommonasthemobile.Theyarebecomingcheaperandmoreandmoreaccurate.AlsotherewillbenewusesfortheGPS.Perhapstheywillbecomelikewatches.Everyonewillhaveoneandyouwillneverbelostanywhere.

  1.GPScanhelpyoufindyourpositioncan’tit?

  2.WhatdoesaGPSlooklike?

  3.HowmanythingsarementionedthatGPSdevicescanbeputinto?

  4.WhydosomepeoplethinkGPSdeviceswillbepopularinthefuture?

  5.Whatistheuseofgroundstations?

  6.Whatistheauthor’spurposeofwritingthispassage?

   

1回答
2020-04-07 16:03
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江四厚

  1.Yesitcan.

  2.Itlookslikeamobilephone.

  3.Five

  4.Theyarebecomingcheaperandmoreaccurateandtherewillbenewuses.

  5.Theycontrolthesatellitesandmakesuretheyareworkingwell

  6.TogiveustheintroductionoftheGPS./TointroduceGPSdevicestopeople.

2020-04-07 16:04:43

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