volume-surface mean diameter 体积表面平均直径
Surface volume mean diameter 面积体积平均径
volume surface mean diameter 体积面积平均径
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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