为你找到 1000 条关于 考试试题0-15 的结果
某人对试样进行测定五次,求得各次的绝对偏差分别为+0.04,-0.02,-0.01,+0.01,+0.06,则此计算结果应该是()的
各绝对偏差之和应该是0或者无限的接近于0
用0.1000mol/LHCl溶液滴定25.00mLNaOH溶液,终点时消耗20.00mL,则NaOH溶液的浓度为()。
nNaOH=nHcl;cV(NaOH)=cV(HCl)0.1×20=c×25
计算分析浓度为0.10mol∙L-1的Na2HPO4水溶液的pH值()。(已知H3PO4的pKa1~pKa3分别是2.12、7.20、12.36.)
Ka2相当于两性物质中酸组分的Ka Na2HPO4作为酸时的解离常数为Ka3Ka1相当于两性物质中碱组分的共轭酸的Ka Na2HPO4作为碱,其共轭酸NaH2PO4的解离常数为Ka2= pH=-lg[H+]=9.78
pH=5.00时,0.20mol/L二元弱酸(H2A)溶液中,H2A的浓度为()mol/L(已知二元弱酸的pKa1=5.00,pKa2=8.00)
浓度=分布分数×分析浓度(注意:相加减的两个数据相差100倍时就可以把小的忽略掉),计算分布分数为0.5, 0.5×0.2=0.1
c(Na2CO3)=0.1mol/L的Na2CO3溶液的物料平衡式是()
[Na+]=0.2mol/L;CO32-在溶液中存在形式可能有三种:H2CO3、HCO3-、CO32-所有型体浓度之和为0.1mol/L
15.<%@page%>指令不一定放在页面的头部。()
15.在xml有如下代码段:<servle><servle-name>teacher</servlet-name><servlet-class>teacherCart</servlet-class></servlet>在Servlet中()把Servlet名:teacher取出来。()(A)使用Servlet的getServletName方法(B)使用ServletConfing的getServletName方法(C)使用ServleContext的getServletName方法(D)使用ServletRequest的getServletName方法
无屈服阶段的塑性材料,以卸载后产生数值为0.2%塑性应变(残余应变)的应力值称为名义屈服极限(屈服强度)
二只50mL容量瓶,分别为(1)、(2),在(1)号容量瓶中加入Cd2+未知液5.0mL,测得扩散电流为10μA,在(2)号容量瓶中加入Cd2+未知液5.0mL,再0.005mol/LCd2+标准溶液5.0mL,测得扩散电流为15μA,未知溶液中Cd2+的浓度是多少(mol/L)()
注意题目中的容量瓶,意思是将溶液要稀释至50mL然后再开始测定
在CuSO4溶液中,用铂电极以0.100A的电流通电10min,在阴极上沉积的铜的质量是多少()毫克已知铜的摩尔质量为64g/mol
t单位为s,i单位为A,m单位为g
15.「あの先生の名前をしっていますか。」  「(      )。」
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.15.Whatdoestheauthorsuggestbusinessesandthegovernmentdo?
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.15.Whatdoestheauthorsuggestbusinessesandthegovernmentdo?
有以下程序main(){intp[8]={11,12,13,14,15,16,17,18},i=0,j=0;while(i++<7)if(p[i]%2)j+=p[i];printf("%d",j);}程序运行后的输出结果是( )
下面程序的输出结果为。main(){inta=1,b=0;switch(a){case1:switch(b){case0:printf("**0**");break;case1:printf("**1**");break;}case2:printf("**2**");break;}}