A.裝配整體式 B.裝配式樓蓋 C.現(xiàn)澆式樓蓋 D.無梁樓蓋
A.1/3(S1+S2) B.1/3S1+1/2S2 C.1/2(S1+S2) D.1/2S1+1/3S2
A.C30 B.C25 C.C20 D.C10