Q
In Belgium method of tunneling _________________?
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A
A. Construction of side walls is completed before invert and roof arch are built
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B
B. Construction of roof arch is completed before side walls and invert are built
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C
C. Construction of invert is completed before side walls and roof arch are built
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D
D. Construction of invert and side walls is completed before roof arch is built
Correct Answer:
B. B. Construction of roof arch is completed before side walls and invert are built