
BS EN 508-1. Roofing products from metal sheet. Specification for self-supporting products of steel, aluminium or stainless steel sheet. Part 1. Steel
出版:British Standards Institution

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BS EN 508-1. Roofing products from metal sheet. Specification for self-supporting products of steel, aluminium or stainless steel sheet. Part 1. Steel
出版:British Standards Institution
專家解讀視頻