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