Pick up the correct statement regarding drilling a tunnel from the fol – McqOptions

MCQOPTIONS

1.	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.
Answer» E.

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