Which of the following advantages are correct regarding Poly-centric s – McqOptions

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1.	Which of the following advantages are correct regarding Poly-centric shape tunnel?1. It can be conveniently used for road and railway traffic2. The number of centres and lengths of radii cannot be fixed3. It can resist external and internal pressure due to its arch action
A.	1 and 2 only
B.	2 and 3 only
C.	1 and 3 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3

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