气-液色谱分离主要是利用组分在固定液上溶解度不同         （    ）

电解液中的微量杂质和未除净的微量氧在滴汞电极上还原所产生的电解电流是残余电流的主要部分（）  

分配问题与运输问题的数学模型结构形式十分相似，故也可以用表上作业法求解。

13.日本人はご飯を食べる前に「（　　　　　）」とい言います。

Imagineyouenteracarwithnosteeringwheel,nobrakeoracceleratorpedals(踏板).Underavoice-activatedcommand,yousayanaddress“Thefastestroutewilltakeus15.3minutes.ShouldItakeit?”Yousay“yes”andyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoissitbackandrelax.Howweirdwoulditbeif,onedayinthefuture,everyonehadsuchacar?Nocrazydiving,noinsults,nocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhand,imaginethecostsavingsforlocalpoliceenforcementandtownbudgetswithoutallthosespeedingandparkingtickets.Anewtechnologyhasthepotentialtochangemodernsocietyinradicalways.There’snoquestionthatself-drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddrop:some94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually-orphysically-impairedpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectric,self-drivingcarswoulddrasticallyreducepollutionlevelsanddependencyonnon-renewablefuels.Roadswouldbequieter,peoplesafer.Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirlivelihoods.AccordingtotheU.S.DepartmentofLabor,inMay2015therewere505,560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself-drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforce,manyofwhomwillbedisplacedbythenewtechnology.Thisissimilartowhat’shappeninginthecoalandoilindustries,asituationthatfuelsmuchofthecurrentpoliticaldiscontentinthiscountry.Newtechnologieswill,andshould,bedeveloped.Thisishowsocietymovesforward.However,progresscan’tbeone-sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsidertheethicalconsequencesofthesepotentialchangestobuildabetterfutureforall.13.Whatwouldbethenegativeimpactofdriverlesscars?

Imagineyouenteracarwithnosteeringwheel,nobrakeoracceleratorpedals(踏板).Underavoice-activatedcommand,yousayanaddress“Thefastestroutewilltakeus15.3minutes.ShouldItakeit?”Yousay“yes”andyouareonyourway.Thecarrespondsandstartsmovingallbyitself.Allyouhavetodoissitbackandrelax.Howweirdwoulditbeif,onedayinthefuture,everyonehadsuchacar?Nocrazydiving,noinsults,nocuttingin;trafficlawswouldberespectedanddrivingmuchsafer.Ontheotherhand,imaginethecostsavingsforlocalpoliceenforcementandtownbudgetswithoutallthosespeedingandparkingtickets.Anewtechnologyhasthepotentialtochangemodernsocietyinradicalways.There’snoquestionthatself-drivingvehiclescouldbeanenormousbenefit.Thepotentialforsafercarsmeansaccidentstatisticswoulddrop:some94%ofroadaccidentsintheU.S.involvehumanerror.Olderdriversandvisually-orphysically-impairedpeoplewouldgainanewleveloffreedom.Maintainingsafespeedsandbeingelectric,self-drivingcarswoulddrasticallyreducepollutionlevelsanddependencyonnon-renewablefuels.Roadswouldbequieter,peoplesafer.Butwemustalsoconsidertheimpactofthenewtechnologyonthosewhonowdependondrivingfortheirlivelihoods.AccordingtotheU.S.DepartmentofLabor,inMay2015therewere505,560registeredschoolbusdrivers.TheAmericanTruckingAssociationlistsapproximately3.5millionprofessionaltruckdriversintheU.S.Thecompaniesdevelopingself-drivingvehiclesshouldbepartneringwithstateandfederalauthoritiestoofferretrainingforthismassiveworkforce,manyofwhomwillbedisplacedbythenewtechnology.Thisissimilartowhat’shappeninginthecoalandoilindustries,asituationthatfuelsmuchofthecurrentpoliticaldiscontentinthiscountry.Newtechnologieswill,andshould,bedeveloped.Thisishowsocietymovesforward.However,progresscan’tbeone-sided.Itisnecessaryforthecompaniesandstateagenciesinvolvedtoconsidertheethicalconsequencesofthesepotentialchangestobuildabetterfutureforall.13.Whatwouldbethenegativeimpactofdriverlesscars?

根据建筑业企业资质管理规定，属于建筑业企业资质序列的是（）。

根据时间价值理论，在普通年金现值系数的基础上，期数减1、系数加1的计算结果，应当等于

习近平总书记在十九大上宣布中国特色社会主义事业进入新时代，怎样理解新时代（）。

2020年9月，甲公司销售产品取得含增值税价款116000元，另收取包装物租金6960元。已知增值税税率为13％，甲公司当月该笔业务增值税销项税额是

乙公司为增值税一般纳税人，2020年9月采取折扣方式销售货物一批，该批货物不含税销售额为60000元，折扣额为6000元。销售额和折扣额在同一张发票的金额栏分别注明，已知增值税税率为13%，乙公司当月该业务增值税销项税额的计算，正确的是

澎湖商场为增值税一般纳税人，2020年10月采取以旧换新方式销售某手机200部，该型号手机同期销售单价为4520元，旧手机每部收购价为800元，已知增值税税率为13％，澎湖商场本月以旧换新销售手机应缴纳的增值税销项税额是()

某企业为增值税一般纳税人，2019年7月份购进原材料取得增值税专用发票上注明的税额为9.6万元，当月销售货物取得不含税销售额50万元:8月份购进原材料取得增值税专用发票上注明的税额为3.2万元，当月销售货物取得不含税销售额80万元。已知增值税税率为13％，取得的增值税专用发票已通过税务机关认证。该企业8月份应缴纳的增值税为(  )万元。

等直杆受力如图，其橫截面面积A=100mm2，则横截面mk上的正应力有四种答案，正确

关于饱和脂肪烃上的卤取代反应，说法正确的是