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【单选题】
已知蓄电池在放电原电池的作用，充电电解池的作用。铅蓄电池在放电和充 电时发生的化学反应可用下式表示：Pb+PbO 2 +2H 2 SO 4 2PbSO 4 +2H 2 O据此判断下列叙述 正确的是A.
放电时负极电极反应式为：PbO 2 +4H + + SO 4 2- +2e - PbSO 4 +2H 2 O
B.
充电时阴极电极反应式为：PbSO 4 +2e - Pb+SO 4 2-
C.
充电时，若要使1molPbSO 4 转变为Pb和PbO 2 ，则需要通过2mol电子
D.
放电时，H + 向负极移动
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举一反三
【单选题】- Is my illness serious? - ____________.
A.
Well done.
B.
Don't worry. You will be well soon.
C.
Sorry, I have no idea.
D.
It's really bad for you.
【单选题】爬泳两臂的配合大致分为三种形式 , 其中 , 当一臂入水时 , 另一臂处于肩前方与水平面成 30° 角左右、刚进入水划阶段的配合形式是指 ( ) 。
A.
前交叉
B.
中交叉
C.
后交叉
D.
都不是
【单选题】But for her charming smile, he ______ her.
A.
wouldn't have married
B.
won't marry
C.
wasn't married to
D.
wouldn't marry with
【简答题】People are reluctant to admit that they don't listen well.
【单选题】— How do you like the curtains? —Well, I’m afraid they don’t ________ very well with the wallpaper.
A.
go
B.
match
C.
suit
D.
fit
【单选题】But for her charming smile, he ______ her.
A.
wasn't married to
B.
won't marry
C.
wouldn't have married
D.
wouldn't marry with
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