Q41
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
AnswerC.
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
Solution
Answer: Option B
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