The axis of a gravity dam is the ______________________

1.	The axis of a gravity dam is the ______________________
A.	line of the crown of the dam on the downstream side
B.	line of the crown of the dam on the upstream side
C.	centre-line of the top width of the dam
D.	line joining mid-points of the base
Answer» C. centre-line of the top width of the dam

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