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。
Unit head circumference maximum and mean blood flow velocities per minute of fetal middle cerebral artery were changed little during the normal second trimester.
每分钟单位头围大脑中动脉的最大速度及平均速度在中孕期间变化小。
The surface area of aggregate per unit volume of mortar does have influence on the mean value of the nearest surface spacing, but the ratio between them is not constant.
单位砂浆体积下集料的表面积的变化对邻近集料表面最近间距的平均值有影响，但二者之间的比值并非常数。
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