Saw toothed drill bits are suitable only for drilling through
A. Very hard rocks
B. Hard rocks
C. Medium hard rocks
D. Soften rocks
Answer: Option C
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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C. 1100 l
D. 1200 l
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