The distance between one room to another room, leaving a small rib in . . . . . . . . meters in room and pillar mining.
A. 2
B. 3
C. 4
D. 5
Answer: Option B
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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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