A.先開(kāi)挖后支護(hù) B.直接開(kāi)挖 C.邊開(kāi)挖邊支護(hù) D.先支護(hù)后開(kāi)挖
A.水泥漿 B.水玻璃 C.石灰漿 D.泥漿
A.0.1% B.0.3% C.0.5% D.1%