问题
选择题
Today's weather isn't as it was yesterday, _____? [ ]
A. wasn't it
B. is it
C. was it
D. isn't it
答案
答案：B
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Today's weather isn't as it was yesterday, _____? [ ]
A. wasn't it
B. is it
C. was it
D. isn't it
答案：B
时，导体中的电流减小了0.4 A；如果所加电压变为原来的2倍，则导体中的电流多大？