constant angle arch dam 等中心角拱坝

obtuse angle arch 钝角拱

constant angle arch 拱中心角不变的拱坝

constant central angle arch dam 等中心角拱坝

Dam constant angle arch 等角拱坝

constant-angle arch 拱中心角不变的拱坝

included angle of arch 拱的包角 ; 指中心角

arch angle 弓角

Longitudinal Arch Angle 足纵弓

central angle of side arch 侧拱圆心角