HB 39-1997 金属屋顶和墙面覆盖层的安装规范
HB 39-1997
行业标准-航空 强制性 现行
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Provides information and guidelines on the selection, performance and installation of metal roofing and wall cladding. The code represents a standard of good practice agreed between manufacturers, roofing contractors and training authorities. The measure
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