A.裝好井口;井控裝置;設(shè)備熄火 B.裝好井口;檢修設(shè)備;井控裝置 C.井控裝置;裝好井口;檢修設(shè)備 D.設(shè)備熄火;井控裝置;裝好井口
A.30m B.50m C.75m D.100m
A.3~5根 B.5~10根 C.10~15根 D.15~20根