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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