A.自下而上逐排砌筑 B.自上而下隨挖隨砌 C.自左而右橫向推進(jìn) D.自右而左橫向推進(jìn)
A.1:1 B.2:1 C.1:6 D.4:6
A.0.2m B.0.5m C.0.8m D.1m