发布时间:2025-01-23 21:12:32
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
如图茶几家具甲醛释放量15mg47l这是欧标e2级是否符合国家标准
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