BS 476-21-1987 Fire tests on building materials and structures — Part 21: Methods for determination of the fire resistance of loadbearing elements of construction
建筑材料和建筑构件防火测试 第21部分:承重构件耐火的测定方法
[attach]72772[/attach] 作者: admin 时间: 2015-5-29 08:19:36