Tunnel Engineering
In the given figure drill holes, heading, mucking and benching are numbered as 1, 2, 3, 4; The correct sequence is:
- A. 4, 1, 2, 3
- B. 1, 2, 3, 4
- C. 4, 1, 3, 2
- D. 3, 4, 1, 3
No answer description available for this question.