Stables usually . . . . . . . . ahead of face in advancing longwall.
A. 6 - 8
B. 4 - 6
C. 8 - 10
D. 10 - 12
Answer: Option C
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
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