下列叙述中正确的有 A.物体两端只要有电势差一定产生恒定电流 b.电流强度是矢量其方�就是正电荷运动的方� c.�属导体中的 Template




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tomski下列叙述中正确的有 a.物体两端只要有电势差一定产生恒定电流 b.电流强度是矢量其方�就是正电荷运动的方� coloring