The percentage of inflammable gas does not exceed . . . . . . . . in the general body of the return air of any ventilating district and . . . . . . . . in any place in the mine.
A. 0.25, 1.75
B. 1.75, 1.35
C. 0.75, 1.25
D. 0.5, 0.75
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Legislation And General Safety
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