搜索 - 科创

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电荷的运动不一定需要电流的回路吧。比如两个金属球，一个带正电和，一个带负电荷，两者接触，就会电荷中和掉，如果两者的电荷正好数量相等，那么两个球都会不带电荷。很显然这个过程有电荷的转移，而没有回路。

1. 我们都知道, 在场地受限的条件下架设天线最方便的方法之一是从窗口拉一根长线出来, 拴到对面的树上, 然后在地面上或者外墙上拉若干条工作频率四分之一波长长度的地网, 和良好的地线拧在一起, 用长线...

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