In “full face” method of constructing tunnels, the first operation relates to______________?
(A) removal of bottom portion
(B) excavation of one drift in the centre
(C) removal of top portion
(D) excavation being done along the periphery
In “full face” method of constructing tunnels, the first operation relates to______________?
(A) removal of bottom portion
(B) excavation of one drift in the centre
(C) removal of top portion
(D) excavation being done along the periphery
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