In Belgium method of tunneling ________?

1364Civil EngineeringMedium

Aconstruction of invert is completed before side walls and roof arch are built

Bconstruction of invert and side walls is completed before roof arch is built

Cconstruction of roof arch is completed before side walls and invert are built

Dconstruction of side walls is completed before invert and roof arch are built

Correct answer

C. construction of roof arch is completed before side walls and invert are built

Explanation

The correct answer is construction of roof arch is completed before side walls and invert are built.

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