DB11∕637-2015 房屋结构综合安全性鉴定标准(高清版).pdf,UG DB11/ 637 2015 J 201 Standard for structure comprehensive safety appraisal of buildings 2015 04 30 2015 06 01 Standard for structure comprehensive safety appraisal of buildings 2015 06 01 3.1.1 6.3