anti-hazard classification 防爆等级

hazard classification system 危险性分类制度

building hazard classification 建筑危险分类

fire hazard classification 火险分类 ; 火灾分类

Hazard classification of the product 物品危害分类

interim hazard classification 临时危害分类

Hazard Classification Document 文件

Transport hazard classification 运输危险级别

transport hazard classification experiment 运输危险性定级试验