A.0.05~0.10g/cm3 B.0.10~0.15g/cm3 C.0.15~0.20g/cm3 D.0.20~0.25g/cm3
A.0.05g/cm3 B.0.10g/cm3 C.0.15g/cm3 D.0.20g/cm3
A.井漏 B.井塌 C.卡鉆 D.井噴