Determination of the area per unit of mass of powders by various methods of air permeametry 通过各种空气渗漏方法对单位粉末质量的单位面积进行的测定
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Sieving and granulometry . determination of the area per unit of mass or volume of powders by permeametry . lea and nurse method 筛分和粒度测定法.用渗透法对粉末的单位质量或单位体积的面积测定.法和法