Q54
Powered supports, hydraulic chocks or linked bars shall be advanced as soon as practicable after a web of coal has been taken off the face. So as to ensure the area of unsupported newly exposed roof is kept to a . . . . . . . .
A.
Maximum
B.
Minimum
AnswerC.
Constant
D.
Medium
Answer: Option B
Solution
Answer: Option B
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