Home / Standards / GB 12987-1997 GB 12987-1997 Abolished Concrete hollow floor slab for rural houses 农房用混凝土圆孔板 Standard Type GB ICS 91.100.30 CCS Q14 Status 废止 Issue Date 1997-07-28 Implementation 1998-02-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A