A.明挖法施工 B.蓋挖順作法 C.蓋挖逆作法 D.噴錨暗挖法
A.一類土,松軟土 B.二類土,普通土 C.三類土,堅(jiān)土 D.四類土,砂礫堅(jiān)土
A.45% B.55% C.65% D.75%