1) Three perpendicular line theorems
三垂线定理
2) geographic vertical
地理垂线;铅垂线
3) setting-out of side plumb-bob
边垂线标定
4) perpendicular axis theorem
垂直轴定理
1.
Studying the perpendicular axis theorem using three-wire pendulum;
用三线摆研究垂直轴定理
2.
This multifunctional experimental instrument not only measures the module of shear of mental thread and the moment of inertial of rings and poles,but also validates the parallel axis theorem and perpendicular axis theorem to reflect the important properties of moment of inertia.
设计了一种基于垂直轴定理的新型吊钩,对切变模量和转动惯量实验进行了改进,使之成为既可测定金属丝切变模量和环、柱等刚体的转动惯量,又可验证反映转动惯量重要性质的平行轴定理及垂直轴定理的多功能实验仪。
5) catenary theory
悬垂线理论
1.
This paper considers the towline as "flexible suspended cable with rigidization" model, and applies catenary theory to analyzing the stress of the towline and to performing the simulation calculation.
将拖缆视为"刚化柔性悬索",应用悬索理论中的悬垂线理论对拖缆的受力进行了分析和仿真计算。
6) generalization of the Vertical Theorem
垂径定理的推广
补充资料：三垂线定理的逆定理
Image:11732716937617776.jpg
三垂线定理的逆定理
在平面内的一条直线，如果它和这个平面的一条斜线垂直，那么它也和这条斜线在平面内的射线垂直。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。