发布时间:2025-01-20 01:09:19
最简单的单层建筑筏板基础厚度一般经验取值不小于300mm,每增加一层筏板的厚度不小于50mm。
三大类岩石的可不可以用肉眼分辨比如如何辨别花岗岩大理石片麻岩石英石页岩砾岩等岩石
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