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

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» E.

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

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