BS476-20:1987建筑材料耐火测试
BS476-20: Fire tests on building materials and structures-Part 20: Method for determination of the fire resistance of elements of construction (general principles)
BS476-20: 对建筑材料和结构的着火试验—第20部分:建筑材料耐火测试(一般原则)
BS476-20:1987建筑材料耐火测试
BS476-20: Fire tests on building materials and structures-Part 20: Method for determination of the fire resistance of elements of construction (general principles)
BS476-20: 对建筑材料和结构的着火试验—第20部分:建筑材料耐火测试(一般原则)