发布时间:2025-01-23 04:00:37
坍落度小于10mm的水泥砂浆称为干硬性水泥砂浆。一般按水泥:砂子=1:2—1:3配制。
徒手检验的方法:抓一把砂浆,一米高松手自由落在地上就散开呈散粒,“手握成团,落地开花”,以此状态为准配制砂浆 。
用途:主要在平面铺装石材及瓷砖时采用
真正意义上的春联出现在哪个朝代 真正意义上的春联出现在什么朝代
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