【单选题】在能源和环保的压力下,新能源电动汽车无疑将成为未来汽车的发展方向。如果电动汽车上使用新型钒电池,一次性充电3—5分钟后,续航能力可达1000公里;而成本造价只有目前锂电池的40%,体积和重量分别是锂电池的1/25和1/10。全钒液流储能电池是利用不同价态离子对的氧化还原反应来实现化学能和电能相互转化的装置,其原理如图所示: 下列有关该钒电池的说法不正确的是:
A.
该电池为可逆电池, 当左槽溶液逐渐由黄变蓝时,为充电过程,此时左槽溶液pH值升高
B.
放电过程中,右槽溶液中溶液颜色由紫色变为绿色
C.
充电过程中, H + 可以通过质子交换膜向右移动,形成电流通路,并且参与电极反应
D.
充电时若转移的电子数为3.01 10 23 个,左槽溶液中n(H + )增加了0.5mol
【单选题】下列各项关于抽样风险和非抽样风险的表述中,不正确的是 ( )。
A.
抽样风险与样本规模呈反向变动,降低抽样风险的唯一途径是扩大样本规模
B.
通过采取适当的质量控制政策和程序可以将非抽样风险降至可接受的水平
D.
抽样风险和非抽样风险通过影响重大错报风险的评估和检查风险的确定而影响审计风险
【简答题】James is a good student and he has lots of friends,but he also has a problem.Some older boys are bullying(欺负)him at school.James is very unhappy and he doesn't know what to do about it.Here are some s...
【单选题】A) He has lots of fans on Facebook. B) He has rich experience in flying. C) He often suffers from toothaches. D) He has learned to pull teeth from a video.
A.
He has lots of fans on Facebook.
B.
He has rich experience in flying.
C.
He often suffers from toothaches.
D.
He has learned to pull teeth from a video.
【判断题】预付年金的终值与现值,可在普通年金终值与现值的基础上乘(1+i)得到。( )
【单选题】A) He has lots of fans on Facebook. B) He has rich experience in flying. C) He often suffers from toothaches. D) He has learned to pull teeth from a video.
A.
He has lots of fans on Facebook.
B.
He has rich experience in flying.
C.
He often suffers from toothaches.
D.
He has learned to pull teeth from a video.
【简答题】James is a good student and he has lots of friends,but he also has a problem.Some older boys are bullying(欺负)him at school.James is very unhappy and he doesn’t know what to do about it.Here are some s...
【简答题】James is a good student and he has lots of friends,but he also has a problem.Some older boys are bullying(欺负)him at school.James is very unhappy and he doesn't know what to do about it.Here are some s...
【简答题】阅读理解。 James is a good student and he has lots of friends, but he also has a problem. Some older boys are bullying (欺负) him at school. James is very unhappy and he doesn't know what to do about it. Her...