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BS 476-21:1987承重材料耐火性測試

 BS 476-21:1987承重材料耐火性測試 BS 476-21: 1987承重材料耐火性測試BS 476-21: Fire test on building materials and structures-Part 21: Method for Determination of the fire resistance of load bearing elements o

2013-11-03 Comments:0BS 476-211987承重材料耐火性測試