题目内容
下列关于电阻说法正确的是( )
2021-12-21
A.导体中有电流,导体才有电阻
B.通过导体的电流越大,阻力就越大
C.导体两端电压越大,电阻越大
D.导体通电有电阻,不通电也有电阻
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