Q51
Pick up the correct statement regarding drilling a tunnel from the following:
A.
Holes are drilled by pneumatically operated rock drills
B.
One drill is required for each 4 to 5 m2 force area
C.
The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
D.
All of the above
AnswerAnswer: Option D
Solution
Answer: Option D
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