- The improvement of the advance rate of roadway drivage is the basic guarantee for constructing highly effcient and productive mines.
- The relationship between mucking earth rate, rotation speed of screw conveyor and advance rate is derived, and later verified by using model test data.
- Whereas the character of roof's movement and falling caused by coal seam is shallow in Shen-dong mine district, the workface advance rate must be picked up dur...
- At this rate we won't be able to afford a holiday.
- At the same time,the resource disposition efficiency of entire industry was gradually dropping;the scale structure efficiency enhanced stably;technology advanced rate always undulated.
- The troops fired at the advancing enemy.