The inflammable gas should be below . . . . . . . . % in the general body of the retunr air way of any ventilating district and below . . . . . . . . % at any place in the mine.
A. 0.85; 1.10
B. 0.95; 1.20
C. 0.75; 1.25
D. 0.65; 1.25
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Ventilation
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