fire grading of buildings 按耐火度的房屋分类 ; 按耐火度的衡宇分类

fire resistance grading 耐火性分级

grading fire 分级着火

grading Standard for fire protection 防火分级标准

drawing for fire insurance grading 火险等级图

grading fire in recirculation zone 回流区分级着火

grading of forest fire calamity 灾害等级划分

forest fire-d anger weather grading 森林火险气象等级