Q.

In a Buttress dam, when the height of dam is 10 m to 25 m, the spacing of buttress is usually restricted to

A. 10 to 15 m
B. 4.5 to 6 m
C. 20 to 25 m.
D. 1.5 m
E. 1 m
Answer» B. 4.5 to 6 m
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