Based on the principle of flight of fan wing aircraft, realizing methods of VTOL are preposed by changing the Angle of attack and increasing chord length of the tail.
基于扇翼机的飞行原理，提出通过改变攻角以及增加尾部升力面弦长的方式提高气动效率，进而实现垂直升降的方法。
This paper analyses the traditional automatic control method and mechanism of nc cold frame bender. The basic principle of control method for measuring chord length is described.
分析了传统的数控肋骨冷弯机控制方法与机构，阐述了弦线测量控制法的基本原理。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
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