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Question
The following operations are required for tunnelling in rocky terrain: 1.Removing the foul gases2.Marking the tunnel profile3.Setting up and drilling4.Checking misfire5.MuckingThe correct sequence is:
Options:
A .  1, 2, 3, 4, 5
B .  2, 3, 5, 4, 1
C .  4, 2, 1, 3, 5
D .  2, 3, 1, 4, 5
Answer: Option D
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