发布时间:2025-01-30 18:55:44
刚性防水套管图集上的DN是刚性防水套管的通径,D1是外径,D2是内径,D3是外径,D4是环外径,L是长度,b是宽度,δ是厚度,K是填充物。
刚性防水套管的适用性:刚性防水套管适用于管道穿墙处,不承受管道振动和伸缩变形的构(建)筑物,对于地震设防要。
实木多层板和实木颗粒板的区别是什么 实木颗粒板好还是实木多层板好
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