下列说法中正确的是 A.负电荷的定�移动不能形成电流b.在电路中电源是提供电压的装置c.物理学规定正电荷定�移动的方�为电流方�d.只要 Template




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tomski下列说法中正确的是 a.负电荷的定�移动不能形成电流b.在电路中电源是提供电压的装置c.物理学规定正电荷定�移动的方�为电流方�d.只要 coloring