成功理工职场英语答案Unit4

Unit4Safety,Maintenance,andQualityControlLessonsTeamProjectReviewAdditionalResourcesEXITUnit4Safety,Maintenance,andQualityControlLesson1.WhatcausedtheexplosionLesson2.ThepreventionofaccidentsLesson3.WearingspecialclothesLesson4.TheamplitudeofmotionLesson5.QualityandafinisheditemLesson6.A“totalqualitycontrol”approachEXITUnit4Safety,Maintenance,andQualityControlAdditionalActivitiesReadingResourcesWritingResourcesUnitTestGrammarResourcesAdditionalResourcesEXITLookatthephotographbelowand,inpairs,answerthequestions.Lesson1Whatcausedtheexplosiona1.Whataccidentdoesthephotographshow?2.Whenandwheredidthisincidenttakeplace?3.Whatcausedtheaccident?4.Howmanyliveswerelostintheaccident?Skimthroughthetextquicklytocheckyouranswers.bNASAspaceshuttleconsistsofthreemajorcomponents:awingedorbiterthatcarriesbothcrewandcargo,anexternaltankcontainingliquidhydrogen(fuel)andliquidoxygen(oxidizer)fortheorbiter’sthreemainrocketengines,andapairoflargesolid-propellantrocketboosters(SRBs).OnJanuary28,1986,theChallengershuttleanditscrewofseven(includingteacherChristaMcAuliffe,whohadbeenselectedtobethefirstprivatecitizeninspace)weredestroyedshortlyafterlaunchfromCapeCanaveral,Florida.TheprimarycauseofthelossoftheChallengerwasthefailureofanO-ringsealofajointononeofthesolidrocketboosters.TheSRBsareconstructedinfourcylindricalsections.Thesehavetobesealedtogethercompletelytopreventtheescapeoftheextremelyhotby-productsoftheburningfuelduringalaunch.TheO-ringsarerubberringsthatplayavitalpartinsealingthejoints.AOnthedayofthelaunch,theweatherwasunusuallycoldandthiscausedtherubberofoneoftheO-ringsonthejointbetweenthebottomtwosegmentsoftherightSRBtobecomebrittle.This,combinedwiththefaultydesignofthejoint,allowedhotgasesfromtheburningsolidrocketfueltoescape.ThegasesandflamesburnedthroughthemetalthatheldtheSRBinposition.WhentheSRBbrokeoff,itrupturedthesideoftheexternalfueltank.Thisallowedtheliquidhydrogenandoxygentomixprematurelyandthisiswhatcausedtheexplosion.Readthefirstparagraphofthetextand,inthediagram,labelthethreemaincomponentsofthespaceshuttle.cHistorycapsuleAnothertragicaccidentoccurredonFebruary1,2003,whentheColumbiaspaceshuttlebrokeupovernorth-centralTexasatanaltitudeofabout40miles(60kilometers)asitwasreturningfromanorbitalmission.Allsevencrewmembersdiedintheaccident.a.___________________________________b.___________________________________c.______________________________________________________________________Readthroughthetextagainandcompletethesentenceswithbecauseorso.d1.TheO-ringwasbrittle__________theweatherwascold.2.TheO-ringwasbrittle,____thisallowedhotgasestoescapefromtheSRB.3.Themetalholdingtherocketwasdamaged,____therocketbrokeloose.4.Thehydrogenandoxygenmixedandexploded__________therocketrupturedthefueltank.becausesosobecauseKeyInyournotebook,writefourconditionalsentencesaboutthecausesoftheaccident.eDrawaseriesofdiagramstoexplainexactlywhatcausedtheChallengeraccident.feg.Iftheweatherhadnotbeencold,theO-ringwouldnothavebecomebrittle.Inpairsorsmallgroups,discussyourreactionstowhatyoureadinthetext.gListentoaninterviewwithaNASAspokespersonandanswerthequestions.h1.WhenwasthePresidentialCommissionontheSpaceShuttleChallengerAccidentcreated?____________________________________________________2.Whowasnamedchairmanofthecommission?_____________________________________________________3.WhosetuptheChallengerDataandDesignAnalysisTaskForce?_____________________________________________________4.Howlongdidthecommission’sinvestigationtake?_____________________________________________________5.Howmanypeoplewereinvolvedintheinvestigation?_____________________________________________________6.Whenwasthecommission’sreportpublished?_____________________________________________________EarlyFebruary1986.WilliamP.Rogers.NASA.Fourmonths.Morethan6,000.EarlyJune1986.KeyScriptListentothenextpartoftheinterviewandcompletethenotes.i1.SRBs:_______________________________2.Anewjointdesign:_________________________________________3.Mainspaceshuttleengines:___________________________________________________________________________________________4.OfficeofSafety,Reliability,Maintainability,andQualityAssurance:_________________________completelyredesignedsubjectedtostringentexaminationandreviewputthroughmostthoroughground-testingprogramintheirhistory,equivalenttomorethan36realmissionsestablishedin1986KeyScriptResearchandprepareareportaboutanotheraccident.Describewhatcausedtheaccident(mechanicalfailure,electricalfailure,materialsfailure,humanerror,etc.),howtheaccidentcouldhavebeenavoided,andwhathappenedasaconsequenceoftheaccident.jInterviewer:WhathappenedintheimmediateaftermathoftheChallengeraccident?Spokesperson:InearlyFebruary1986,PresidentRonaldReaganannouncedthecreationofaPresidentialCommissionontheSpaceShuttleChallengerAccident.Interviewer:KnowntomostpeopleastheRogersCommission,right?Spokesperson:That’sright.ThechairmanofthecommissionwasWilliamP.Rogers.Atthesametime,NASAestablishedtheChallengerDataandDesignAnalysisTaskForcetosupporttheworkoftheCommission.Intervie