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In Belgium method of tunnelling | |
A. | construction of side walls is completed before invert and roof arch are built. [Wrong Answer] |
B. | construction of roof arch is completed before side walls and invert are built. [Correct Answer] |
C. | construction of invert is completed before side walls and roof arch are built. [Wrong Answer] |
D. | construction of invert and side walls is completed before roof arch is built. [Wrong Answer] |
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