下列关于电流的说法正确的是 A.电流一定是正电荷移动形成的b.电流一定是负电荷移动形成的c.自由电荷定�移动形成电流d.规定负电荷移动方� Template




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tomski下列关于电流的说法正确的是 a.电流一定是正电荷移动形成的b.电流一定是负电荷移动形成的c.自由电荷定�移动形成电流d.规定负电荷移动方� coloring