Question: What is a 'tunnel boring machine' ( TBM ) primarily used for? A ) Excavating tunnels in soft ground conditions B ) Providing ventilation within

What is a 'tunnel boring machine' (TBM) primarily used for?
A) Excavating tunnels in soft ground conditions
B) Providing ventilation within the tunnel during construction
C) Boring wells for water supply adjacent to the tunnel
D) Reinforcing the tunnel walls after excavation

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