It is the electric charge density.

这是电荷密度。

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By the charge density we mean the per unit volume.

所谓的电荷密度是指单位体积的电荷。

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The mean charge depth and the charge density can be calculated.

电荷重心和电荷密度可通过计算得出。

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The mean charge depth and the charge density can be calculated.

电荷重心和电荷密度可通过计算得出。

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