Q133
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
AnswerD.
0.5, 0.75
Answer: Option C
Solution
Answer: Option C
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