2.如图所示两个截面不同长度相等的均匀铜棒接在电路中两端电压为则 A.通过两棒的电流不相等 B.两棒的自由电子定�移动速率不同 Template




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tomski2.如图所示两个截面不同长度相等的均匀铜棒接在电路中两端电压为则 a.通过两棒的电流不相等 b.两棒的自由电子定�移动速率不同 coloring