The advantages of using alluminium rods
A. Increase of machine capacity
B. Handling easy
C. More rapid recovery of drill string, faster rotation
D. All these
Answer: Option D
This Question Belongs to Mining Engineering >> Coal Mining
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
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B. 600 l
C. 1100 l
D. 1200 l
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