Whichwritingtechniquedoesthefollowingsentenceuse,“telling”or“showing”?AnarticleIreadlastyearchangedmylife.
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Putthefollowingwordsandphrasesintheblanks; changetheformwherenecessary. Some can be used more than once.While,what’smore,before,inthemorning,after,atsixo’clockunfortunately,intheevening,until,atlast,luckily,thenextmorning,assoonas,sixdayslater1)__________Iwasastudentatuniversity,IwenttoCanadaforseveralmonths.Mymotherwantedmetovisitsomeofherfriendsandrelativesthere.AndItraveledbybustoMontrealinEasternCanada.IwantedtoseethewholeEasternCanadabeforeIreturnedtoEngland.Early2)__________,weleftVancouver.WhenwereachedtheRockyMountains3)___________,thebusstopedforanhour.4)___________wewerewaiting,Iboughtacupofcoffeeandasandwich.Wewaitedinthecafe5)__________averyoldbusarrived.Thebusbumpedandswayed6)___________weweretravelingthroughthemountains.Wedroveforeighthours7)____________Icouldgotosleep.WearrivedinEdmonton8____________intheeveningaftertravelingfor34hours.9)_____________westopped,Iboughtsomesupper.Iplannedtocatchanotherbusthatevening.10)_____________thenightbustothenextlargetownwasfull.11)_____________,allthecheaphotelswerefull.12)______________Ihadspentaveryuncomfortablenightinthebusstation,IleftEdmonton13)______________.IarrivedinMontreal14)__________,feelingveryill.15)____________IwasstayingwithafriendinMontrealwhowasadoctor.Hisfamilylookedaftermeforseveraldays16)____________Ifeltbetter.IwassohappywhenIwas17)_____________onashipforEngland.
拉伸试验时,试样拉断前能承受的最大标称应力称为材料的()。
A. 屈服强度
B. 抗拉强度
测定淬火钢件的硬度,一般常选用( )来测试。
A. 布氏硬度计
B. 洛氏硬度计
金属在力的作用下,抵抗永久变形和断裂的能力称为( )。
A. 硬度
B. 塑性
C. 强度