A.放坡開挖 B.土圍堰 C.噴射混凝土 D.混凝土圍圈
A.0.75m B.1.50m C.1.75m D.2.0m
A.黏性土、濕陷性土 B.粉質(zhì)土、砂類土 C.砂類土、碎石類土 D.碎石類土、卵石類土