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职称英语考试概括大意模拟练习2018年职称英语考试概括大意精选模拟练习Donteverletyourenemiesseeyoufall,alltheywantistoseeyoumessup,don’tgivethemthepleasure.Bestrong,provethemwrong.以下是小编为大家搜索整理的2018年职称英语考试概括大意精选模拟练习，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!1.Childrenenjoyshoutingatahighwallandhearingthesoundcomebacktothem.Thesesoundsarecalledechoes(回声).Echoeshavegivenusanumberofvaluabletools.2.Echosoundingdeviceswereearlyusedinmakingmapsoftheoceanfloor.Soundsorultrasonic(超声的)soundsmakegoodtoolsfordetermininghowdeepthewaterisunderships.Sometimesechoesfromultrasonicdistancefindingdeviceswerepreventedfromworkingbyfishswimmingpastorbythepresenceoflargeobjects.Soultrasonicdeviceshavebeenreplacedbyothertools.3.Radarisnowafamiliartool.Likemanyothersitwasanunexpecteddiscovery.Itwasfirstobservedbytworesearchers，whowerestudyingsoundcommunication.TheyweresendingsignalsfromastationononesideofariverinWashington，DIC.toavehicleacrosstheriver.Theydiscoveredthattheirsignalswerestoppedbypassingships.Theyrecognizedtheimportanceofthisdiscoveryatonce.4.Allthiswasofcoursejustastart，fromwhichourpresentradarhasdeveloped.Theword"radar，"infact，getsitsnamefromtheterm"radiodetection(检测)andranging.""Ranging"isthetermfordetectionofthedistancebetweenanobjectandtheradarset.Today，inourscientificage，itwouldbedifficulttomanagewithoutradar.5.Oneofthemanyusesofradarisasaspeedcontroldeviceonhighways.Whenapersoninanautomobileisdrivingfasterthanthespeedlimit，radarwillshowthisclearlyandthetrafficpolicecantakemeasurestostophim.6.Apilotcannotflyaplanebysightalone.Manyconditionssuchasflyingatnightandlandingindensefogrequirethepilottouseradar.Humaneyesarenotverygoodatdeterminingspeedsofapproachingobjects，butradarcanshowthepilothowfastnearbyplanesaremoving.23Paragraph224Paragraph325Paragraph426Paragraph5AStudyofSoundBHighwayPoliceCWorkingPrinciplesDEarlyUseof"Radar"EUsefulToolsFDiscoverybyChance27Echo-soundingdeviceswereearlyusedto28Ultrasonicdevicewereusedto29Policeuseradaronhighwaysto
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