A.建筑物級別 B.極限狀態(tài) C.破壞性質(zhì) D.結(jié)構(gòu)種類
A.梁高h=300mm B.梁高h=400mm C.梁高h=450mm D.梁高h=500mm
A.85% B.90% C.95% D.98%