
Fire-resistance tests - Elements of building construction Part 4: Specific requirements for loadbearing vertical separating elements
出版:International Organization for Standardization

专家解读视频
KS F 2257-4:2015 - Modified
KS F 2257-4:2004 - Modified
GB/T 9978.4-2008 - Modified
DIN 4102-2 (1977-09) - Identical