根据公式R=U/I,可以知道                           

根据公式RUI,可以知道                                   

       A.一段导体的电阻,在电压不变时,与电流强度成正比

       B.一段导体的电阻,在电流强度不变时,与电压成正比

       C.一段导体的电阻,与电压成正比,与电流强度成反比

       D.导体的电阻等于这段导体两端的电压与通过导体的电流强度的比值

答案

D

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