size grade of soil
... size frequency curve 颗粒散布粒径曲线 size grade of soil 土壤粒径度 size of grain 颗粒年夜小 ...
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采集土壤样品，在实验室进行土壤镭含量、含水量、孔隙度和粒径分布等物理性质测量。
Soil radium contents, water contents, soil porosity and grain size were concretely analysed in our laboratory.
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