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。
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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