In "full face" method of constructing tunnel, the first operation rela

1.	In "full face" method of constructing tunnel, the first operation relates to
A.	removal to bottom portion
B.	excavation of one drift in the centre
C.	removal of top portion
D.	excavation being done along the perimeter
Answer» D. excavation being done along the perimeter

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In "full face" method of constructing tunnel, the first operation relates to

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