The length of the needle beam used in needle beam method of tunnelling is usually Options: A . &nbsp2 m to 4 m B . &nbsp2.5 m to 6 m C . &nbsp4 m to 7 m D . &nbsp5 m to 6 m

The length of the need

Question

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

Options:

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

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