Q20
In compressed air tunnelling, the volume of free air provided is
A.
6 m3 per second per m2 of face area
B.
6 m3 per minute per m2 of face area
AnswerC.
20 m3 per minute per m2 of face area
D.
6 m3 per hour per m2 of face area
Answer: Option B
Solution
Answer: Option B
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