Gradation of roof waterproofing into 4 levels and that of roof waterproofing material into 4 levels for 3 kinds were proposed.

 
  • 提出了屋面防水分為4個(gè)等級和屋面防水材料分為3類(lèi)4個(gè)等級,介紹了設防層次的選擇和多道設防的具體作法。
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