Which of the following lining material is useful for shield driven tunnels in sub aqueous regions??

Which of the following lining material is useful for shield driven tun

1.	Which of the following lining material is useful for shield driven tunnels in sub aqueous regions??
A.	Stone masonry
B.	Timber
C.	Cast iron
D.	Cement concrete
Answer» D. Cement concrete

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Which of the following lining material is useful for shield driven tunnels in sub aqueous regions??

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