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地沙和河沙有啥区别
更新时间: 2020-10-30 00:00:00  

河砂是经由河流搬运的冲积砂,一般指粒径小于5mm的颗粒,成份与沿河流域有关。

地质砂是指粒径为

关键词: 河沙 区别

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