《Mine Dust Prevention》Test Example
1 Mine Dust
1 All exhaust systems, whether simple or complex, have in common the use of________, ________, and __________and __________ that leads to __________.
1. List the mine dust hazards?
1. For Coal mining operations, If a dust sample contains 25% quartz, what would be the regulation standard for the dust?
1 The longwall mining is the most widely used mining method. Please make a statement of coal dust control in a longwall mining working face.