The percentage of inflammable gas in an u/g coal mine should not exceed
A. 0.75% in the general body of the return air of any ventilation district and 1.5% in any place of the mine
B. 0.75% in the general body of the return air of any ventilation district and 1.25% in any place of the mine
C. 0.5% in the general body of the return air of any ventilation district and 1.25% in any place of the mine.
D. 0.5% in the general body of the return air of any ventilation district and 1.5% in any place of the mine.
Answer: Option B
This Question Belongs to Mining Engineering >> Mine Ventilation
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