发布时间:2025-01-18 09:49:25
要看设计要求了 楼板在施工中可以后置钢管套,用强度等级高于原楼板设计的混凝土密实,PE管穿过钢套管中间可以用弹性妮子填充间隙,也方便换管修护,从而减少PE管在加载加压的过程中对砼楼板的摩擦震动
bosch47博世 灰阶系列 零度维他保鲜 混冷冰箱适用对象
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