A helix equation of time-varying pitch is established, revolving elliptic cylinder as equal angular velocity and rising as variable velocity at the same time.
建立了绕椭圆柱面以等角速度旋转，又以变速度上升的非定常螺距的螺旋线方程。
A helix equation of time-varying pitch is established, revolving elliptic cylinder as equal angular velocity and rising as variable velocity at the same time.
建立了绕椭圆柱面以等角速度旋转，又以变速度上升的非定常螺距的螺旋线方程。
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