题目内容
粘性是流体物性之一,无论是否有粘性。
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尽管粘性是流体的物性之一,但只有对流动的流体才考虑粘性的影响,对静止的流体不考虑粘性的影响。
降低温度液体的粘性增加。
升高温度气体的粘度减小。
This audio file covers the following 13 questions.（注意：专有名词首字母需大写） BBCNews.Hello,thisisJerrySmit.Themanwho(1)_________twopeopletodeathincentralLondonyesterdayhasbeen(2)___________bypoliceasa(3)__________whowasfreedonparolelastyear.UsmanKhanwasshotdeadbyarmedofficersafterhewas(4)_________bymembersofthepublic.TheBritishPrimeMinisterBorisJohnsonsaidhehadlongarguedthatit wasamistaketoletseriousandviolentcriminalsoutofprisonearly.Hesaidthepublic wantedtosee(5) _________inforceforsuch(6)__________.SpeakingtotheBBC,themayorofLondonSadiqKhansuggestedthatcutsinservicesbythegovernmenthadplayedarole.I'veseenpersonallyasaformerlawyer,asa formerjusticesecretary,butalsoasthemayor,the(7) ___________ ofhugecutsinthe (8)_________,theprobationservicebeingprivatized,asidefromthecutsinpoliceandthat musthaveanimpact.Officialshavepraisedthe(9)_________ofthepeoplewho(10)_________ theattacker,someusedimprovisedweapons.SimonJoneshasthedetails.AfterUsman Khanbeganhisattackataconference,weunderstandoneofthe (11)_________tookanornamentaltoothfromawhalewhichwasonthewallandusedthattotrytofendoffhisattack.TheattackerwasthenchasedontoLondonBridge.Membersofthepublicheldhimdown.Onepersonusedthe (12)_________,letitoffinhisfacetotrytokeephimatbayandpeopleheldhimonthe bridgeforaroundfiveminutesuntilthepolicearrivedandtheyshothimdead(13)_________hewaswearingsomesortofbomb.Asforthepeoplewhowereinjured,threeofthemtheyremaininhospitalthismorning.
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