Which of the following statements about rock rise are correct ( )?
选项:
A:It should be arranged in the stable rock stratum of the coal seam floor and 10-20 m away from the coal seam floor;
B:The production system is reliable, the ventilation condition is good, and the goaf is easy to be closed, which is good for preventing spontaneous combustion;
C:More gangue discharge and environmental pollution;
D:It is easy to be affected by coal seam dip angle, so it is necessary to take straight driving according to coal seam dip angle
发布时间:2024-05-17 18:15:35