What are the technical factors to be considered in mining methods? ( )
A: Equipment level
B: Technology method
C: Strata control
D: Cost per ton of coal
A: Equipment level
B: Technology method
C: Strata control
D: Cost per ton of coal
举一反三
- What are the disadvantages of ramp development method?( ) A: Large amount of development work B: Trackless equipment has large initial investment, heavy maintenance workload and high technical level requirements C: The development depth is restricted by driving technology and economic factors D: No steel is required
- What factors should be considered if a company plans to adopt cost leadership strategy?
- The<br/>following factors which do not affect the selection of statistical<br/>forecasting methods are__________. A: method suitability B: method cost C: prediction result accuracy D: method popularity
- In the high-low method, the change in total cost is due to: A: a. fixed cost per unit B: b. mixed cost per unit C: c. total fixed cost D: d. variable cost per unit
- During top coal caving mining, the essential cause of top coal crushing is ( ). A: softening of water in roof strata B: the stress it beared is large than its own strength C: the gas in the top coal expands, leading to breakage D: cracks produced by raw coal during its formation