下列关于电流和电压的说法中正确的是a.正负电荷定�移动都会形成电流b.电路中的电流是形成电压的原因c.自由电荷定�移动的方�为电流方�d Template




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tomski下列关于电流和电压的说法中正确的是a.正负电荷定�移动都会形成电流b.电路中的电流是形成电压的原因c.自由电荷定�移动的方�为电流方�d coloring