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【单选题】
人造地球卫星用到的一种高能电池--银锌蓄电池，其电池的电极反应式为：Zn+2OH - -2e - =ZnO+H 2 O， Ag 2 O+H 2 O+2e - ==2Ag+2OH - 。据此判断氧化银是 [ ]A.
负极，并被氧化
B.
正极，并被还原
C.
负极，并被还原
D.
正极，并被氧化
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举一反三
【单选题】When estimating expenses for a budget,
A.
last month's and last year's expenses are not a good starting point.
B.
many of the same expenses do not occur each month.
C.
large unusual expenses such as car or hospital bills should be included.
D.
estimating your future assets is a good starting point.
【单选题】38 Piles of dung can’t be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter an over the region．
C.
they are different in decay rate．
D.
they are different in quality．
【单选题】Piles of dung can't be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter all over the region
C.
they are different in decay rate
D.
they are different in quality
【单选题】Piles of dung can’t be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter an over the region．
C.
they are different in decay rate．
D.
they are different in quality．
【简答题】Piles of dung can' t be relied upon when it comes to estimating elephant numbers because.
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