The length of the needle beam used in needle beam method of tunnelling is usually

1.

The length of the needle beam used in needle beam method of tunnelling is usually

[A].	2 m to 4 m
[B].	2.5 m to 6 m
[C].	4 m to 7 m
[D].	5 m to 6 m

Answer: Option D

Explanation:

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