英语四级考试的试题与答案

英语四级考试的试题与答案 　Design of all the new tools and implements is based on careful experiments with elect

英语四级考试的试题与答案 Designofallthenewtoolsandimplementsisbasedon carefulexperimentswithelectronicinstruments.First,a human“guineapig”istestedusingaregulartool. Measurementsaretakenoftheamountofworkdone,andthe buildupofheatinthebody.Twistedjointsandstretched musclescannotperformaswell,ithasbeenfound,as jointsandmusclesintheirnormalpositions.Thesame personisthentestedagain,usingatooldesignedaording tothesuggestionsmadebyDr.Tichauer.Allthesetests haveshownthegreatimprovementofthenewdesignsover theold. OneoftheelectronicinstrumentsusedbyDr.Tichauer, themyograph(肌动记器),makesvisiblethroughelectrical signalstheworkdonebyhumanmuscle. Anothermachinemeasuresanydangerousfeaturesof tools,thusprovinginformationuponwhichtobaseanew design.Oneconclusionoftestsmadewiththismachineis thatatripodstepladderismorestableandsafertouse thanonewithfourlegs. Thisworkhasattractedtheattentionofefficiency expertsandtime-and-motion-studyengineer,butitsvalue goesfarbeyondthat.Dr.Tichauer’sfirstthoughtisfor thehealthofthetooluser.Withtherepeateduseofthe sametoolalldaylongonproductionlinesandinother