1.

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 :

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» E.


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