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(2003•泰州)如图,某防洪大坝的横断面是梯形,斜坡AB的坡度i=1:2.5,...
(2003•泰州)如图,某防洪大坝的横断面是梯形,斜坡AB的坡度i=1:2.5,则斜坡AB的坡角α为(精确到1°)( )
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A.24°
B.22°
C.68°
D.66°
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