试题与答案

下列说法正确的是( ) A.自由电荷的运动必定形成电流 B.形成电流必须要有自由

题型:多选题

题目:

下列说法正确的是(  )

A.自由电荷的运动必定形成电流

B.形成电流必须要有自由电荷

C.形成电流必须要有电压

D.有电压必定形成电流

答案:

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