卫生类职称英语[2018年职称英语《卫生类》概括大意练习(八)].docx

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1、卫生类职称英语[2018年职称英语《卫生类》概括大意练习（8）]1.Childrenenjoyshoutingatahighwallandhearingthesoundebacktothem.ThesesoundsarecalledechoesEchoeshavegivenusanumberofvaluabletools.（回声）.2.Echosoundingdeviceswereearlyusedinmakingmapsoftheoceanfloor.Soundsorultrasonic（超声的）soundsmakegoodtoolsfordet

2、ermininghowdeepthewaterisunderships.Sometimesechoesfromultrasonicdistancefindingdeviceswerepreventedfromworkingbyfishswimmingpastorbythepresenceoflargeobjects.Soultrasonicdeviceshavebeenreplacedbyothertools.3.Radarisnowafamiliartool.Likemanyothersitwasanunexpecteddiscovery.Itwa

3、sfirstobservedbytworesearchers,whowerestudyingsoundmunication.TheyweresendingsignalsfromastationononesideofariverinWashington,DIC.toavehicleacrosstheriver.Theydiscoveredthattheirsignalswerestoppedbypassingships.Theyrecognizedtheimportanceofthisdiscoveryatonce.4.Allthiswasofcour

4、sejustastart,fromwhichourpresentradarhasdeveloped.Theword"radar,"infact,getsitsnamefromtheterm"radiodetection（检测）andranging.""Ranging"isthetermfordetectionofthedistancebetweenanobjectandtheradarset.Today,inourscientificage,itwouldbedifficulttomanagewithoutradar.5.Oneofthemanyus

5、esofradarisasaspeedcontroldeviceonhighways.Whenapersoninanautomobileisdrivingfasterthanthespeedlimit,radarwillshowthisclearlyandthetrafficpolicecantakemeasurestostophim.6.Apilotcannotflyaplanebysightalone.Manyconditionssuchasflyingatnightandlandingindensefogrequirethepilottouse

6、radar.Humaneyesarenotverygoodatdeterminingspeedsofapproachingobjects,butradarcanshowthepilothowfastnearbyplanesaremoving.23Paragraph224Paragraph325Paragraph426Paragraph5AStudyofSoundBHighwayPoliceCWorkingPrinciplesDEarlyUseof"Radar"EUsefulToolsFDiscoverybyChance27Echo-soundingd

7、eviceswereearlyusedto28Ultrasonicdevicewereusedto29Policeuseradaronhighwaysto30RadarhelpspilotstoAdetectnearbyobjectsBdeterminethedepthoftheoceanwaterCdecidehowfastyoudriveDstoppassingshipsEmaptheoceanfloorFobservewaterflow[参考答案]23.D24.F25.C26.B27.E28.B29.C30.A内容仅供参考