本文研究离心纺纱时的纱线曲线，计入空气阻力，得出近似方程式（9）。
With air resistance taken into account, the approximate equation for yarn curve slope is given as (9);
利用空间坐标变换法，得出弯管状屏蔽体的曲面方程式，用精确解析解取代了常用的数值近似解。
The camber equation has been established by means of space alternate coordinate; the numerical approximate calculation is replaced by accurate calculation.
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