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【单选题】
某新型二次锂离子电池结构如右图,电池内部是固体电解质,充电、放电时允许Li + 在其间通过(图中电池内部“→”表示放电时Li + 的迁移方向.充电、放电反应可表示为:LiCoO 2 +6C 放电 充电 Li 1-x C O O 2 +Li x C 6 .下列说法正确的是( )
A.
外电路上的“→”表示放电时的电流方向
B.
充电时发生还原反应的物质是Li x C 6
C.
放电时负极的电极反应为:LiCoO 2 -xe - =Li 1-x C O O 2 +xLi +
D.
外电路有0.1mole - 通过,发生迁移的Li + 的质量为0.7x g
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【单选题】如果在一年里全社会用现金支付的销售商品总量是5000亿件,平均价格水平是8元,在这一年里货币平均周转五次。那么这一年里货币发行量应为()亿元,如果这一年实际发行了16000亿元纸币,这可能会引起。()
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【单选题】Is the food in fast food restaurants always ready before the customers order it?
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Yes,it is.
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【简答题】求下列各公式的主析取范式和主合取范式: ( 「 P → Q) ∧ (R ∨ P) 。
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【单选题】Dave asks "Ready to order?" What does he mean?
A.
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B.
He will take their order now.
C.
He is ready to close the Rock.
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查看完整题目与答案
【单选题】--Are you ready to order now? ______________________
A.
Yes, I’d like a beef steak.
B.
It’s too expensive.
C.
It’s my favourte.
D.
Yes, I want to order.
查看完整题目与答案
【单选题】Is the food in fast food restaurants always ready before the customers order it?
A.
Yes,it is.
B.
N0,it is seldom ready.
C.
Yes,it is cooked to order.
D.
N0,not always,but usually.
查看完整题目与答案
【简答题】求下列各公式的主析取范式和主合取范式: ( 「 P → Q) ∧ (R ∨ P) 。
查看完整题目与答案