fire classification testing 燃烧分级试验

fire resistance classification 耐火性分类 ; 耐火性分级 ; 耐火等级

Early fire classification 早期火灾分类

Fire classification and testing pack 火灾分级和检验包

fire hazard classification 火险分类 ; 火灾分类

classification of fire hazards 火灾危险性分类

Classification of fire resistance 防火性能的分类

fire risk classification 火灾危险类别

Fire Safety Classification 消防安全分级