问题
选择题
— How's the weather today?
— [ ]
A. It's Sunday.
B. It's rainy.
C. It's blue.
答案
答案：B
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— How's the weather today?
— [ ]
A. It's Sunday.
B. It's rainy.
C. It's blue.
答案：B
，通过电阻的电流跟它两端的电压成正比，跟它的电阻成反比
，导体的电阻跟它两端的电压成正比，跟通过它的电流成反比