发布时间:2025-01-23 20:23:24
水比重为1,水泥比重为3,则泥浆比重为(1+0.6)/(0.6/1 + 1/3)=1.714g/cm³
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2025-01-23 20:23:242018年3500到万元笔记本电脑推荐中哪款更适合预算有限且注重续航的用户
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