BS 476-20：建筑材料和构件的防火测试.第20部分:建筑构件耐火的测试方法(一般原理)
日期:2011-02-16 21:57
r which appropriate criteria have been satisfied. The times so obtained are a measure of the adequacy of the construction in a fire but have no direct relationship with the duration of a real fire.
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