问题
选择题
In case it thunders, we'd better _____ the electricity at once and turn off the TV. [ ]
A. cut in
B. cut off
C. cut down
D. cut away
答案
答案：B
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In case it thunders, we'd better _____ the electricity at once and turn off the TV. [ ]
A. cut in
B. cut off
C. cut down
D. cut away
答案：B
a极板 | b极板 | x电极 | z溶液 | |
A． | 锌 | 石墨 | 负极 | CuSO4 |
B． | 石墨 | 石墨 | 负极 | NaOH |
C． | 银 | 铁 | 正极 | AgNO3 |
D． | 铜 | 石墨 | 负极 | CuCl2 |
