Strong roof and unyielding floor tends to
A. Heave the floor
B. Spontaneous heating
C. Crush roof
D. Crush the side of pillars
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 . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
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