静电平衡状态:带电体系中的电荷静止不动时,称为处于静电平衡状态;达到静电平衡时,导体所带的电荷都分布在导体表面上,导体内部不可能
回答: x',ct'组成一个仿射坐标系:它所表现的运动规律并不是物质的真实运动规律,而是它的抽象运动规律。也就是说,它所反映地仅仅是射影
由 marketreflections
于 2011-05-15 17:22:26
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