中文字幕av久久爽一区-中文区中文字幕免费看-精品国产青草久久久久福 ,免费大片黄国产在线观看,福利姬在线视频国产观看,国产亚洲欧美一区二区三

Standards and specifications for implementation:

Fireproof Window GB16809-1997

Safety glass for construction, fireproof glass GB15763.1-2001

Technical conditions for the passage of fire-resistant glass non-load-bearing partitions CA 97-1995

Test method for fire resistance of glazing members GB/T 12513-200