A.20 B.50 C.30 D.24
A.1.0%~3.0% B.1.5%~2.0% C.1.0%~2.0% D.2.0%~3.0%
A.沉降縫 B.建筑物設(shè)置的伸、縮縫 C.抗震縫 D.各類施工縫