Q173
Rate of penetration of compressed air drills varies from . . . . . . . . in hard rocks in m/min.
A.
0.1 - 0.2
B.
0.2 - 0.3
AnswerC.
0.3 - 0.4
D.
0.4 - 0.5
Answer: Option B
Solution
Answer: Option B
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