(A) It is suitable for construction in unstable rocks
(B) In this method, it is easy to install timber support
(C) Tunnelling can be continuous and the work can be expedited
(D) In case of excessive water, it is easy to take correct steps
(A) It is suitable for construction in unstable rocks
(B) In this method, it is easy to install timber support
(C) Tunnelling can be continuous and the work can be expedited
(D) In case of excessive water, it is easy to take correct steps
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