体电荷密度
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.
Average free path of ball movement was directly proportional to ball radius, ball density and cylinder volume and inversely proportional to material mass and charge ratio.
磨球运动的平均自由程与磨球半径、磨球密度、球罐体积成正比,与粉碎物料质量、球料比成反比。
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