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。
Constant average social productivity of labour is the basis of historical cost measure attribute, constant money value stabilization is the basis of nominal moneytary measure unit.
历史成本会计原则的直接基础有两个，即社会平均劳动生产率不变假设和币值稳定假设。
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