发布时间:2025-02-05 02:08:50
C40表示该批混凝土立方体抗压强度标准值是以150mm边长的混凝土立方体试件在20±2℃,相对湿度为95%以上的标准养护室中养护,或在温度在20±2℃的不流动的Ca(OH)2饱和溶液中养护28天测得的混凝土抗压强度为40MPa,此抗压强度具有95%概率的保证。
我家顶楼有两个卫生间卧室里的卫生间潮气大浴霸换气扇排不出去水蒸汽请问怎么
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