Civil Engineering - Tunnelling - Discussion

Discussion Forum : Tunnelling - Section 1 (Q.No. 39)
39.
In the given figure drill holes, heading, mucking and benching are mumbered as 1, 2, 3, 4 The correct sequence is :
4 1 2 3
1 2 3 4
4 1 3 2
3 4 1 3
Answer: Option
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