Q18
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
AnswerD.
0.65; 1.25
Answer: Option C
Solution
Answer: Option C
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