椭圆柱面
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cylindrical elliptic surface 二次椭圆面
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For the elliptic cylindrical surface which is the trunk of the blade, the geodesic and non-geodesic differential equations are deduced.
并针对叶片主干部分的椭圆柱面,分别推导其测地线和非测地线的微分方程序。
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