电子的定�移动形成电流，为什么电子和电流的方�相反？ 知乎 Sketch Coloring Page

电子的定�移动形成电流，为什么电子和电流的方�相反？ 知乎 Template

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tomski电子的定�移动形成电流，为什么电子和电流的方�相反？ 知乎 coloring

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