The average grain diameter as determined from a random cross section.
从材料任一横截面上测量的晶粒直径的平均值。
There is a certain relation between the porosity and the average grain diameter.
平均粒径与孔隙率存在一定关系；
The average grain diameter and cumulative relative curve of red sandstone are obtained by the grain size analysis.
对红砂岩进行粒度分析，得出其平均粒径和概率累计曲线。
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