电流是从自由电子的电子定向移动的速率吗？

来源：蜘蛛抓取(WebSpider) 时间：2016-11-25 12:42 标签： 自由电子定向移动
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/etc/nginx/nginx.conf.急！ “只有自由电子的定向移动才能形成电流”是否正确？为什么？_百度知道

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