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
内容
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An analysis of past maintenance costs indicates that maintenance cost is an average of $0.40 per machine-hour at an activity level of 20,000 machine-hours and $0.50 per machine-hour at an activity level of 16,000 machine-hours. Assuming that this activity is within the relevant range, what is the total expected maintenance cost if the activity level is 18,500 machine-hours? A: $1,600 B: $6,960 C: $8,000 D: $9,000
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What are the benefits of tilting the layered steps? ( ) A: Easy to separate mining of ore and rock and improve ore quality B: Convenient for transportation equipment operation C: Convenient for mining equipment operation D: Ease of layering
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Which of the following methods is not the research based on market method? A: Questionnaire B: Data mining C: User interview D: User observation
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Which of the following is not a major problem to be solved in mine field development method?( ) A: Mining methods B: Shaft (adit) form C: Number of mining levels D: Layout of main haulage roadway
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What is the purpose of considering such factors as cost and quality during tender evaluation? A: To find the most economical advantageous tender. B: To ask the suppliers to lower cost and improve quality. C: To learn about the financial stability and service level of the suppliers.