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. The following operations are required for tunnelling in rockYAerrain? 1. Renmving the foul gases 2. Marking the tunnel profile 3. Setting up and drilling 4. Checking misfire 5. Mucking The 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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