一个带正电小球的单�,在其平衡位置下方放一带负电小球,单��期与不放负电小球时是否相同,为什么? 知乎 Template




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tomski一个带正电小球的单�,在其平衡位置下方放一带负电小球,单��期与不放负电小球时是否相同,为什么? 知乎 coloring