4) 极轴（polar axis）: 指通过髋臼部分内球面中心并垂直于髋臼凸缘平面的轴；如果髋臼没有凸缘，则是指 通过款就部件内球面中心并垂直于髋臼基；底平面...
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mean polar axis 平极轴
polar axis tracking system 极轴跟踪系统
heliostat with polar axis 极轴式定日镜
telescope polar axis 望远镜极轴
polar axis rolling method 极轴翻滚试验
polar symmetry axis 极性对轴 ; 极性对称轴
tracking method with polar axis 极轴跟踪方式
Polar r axis 极轴
N the fixed line in a system of polar coordinates from which the polar angle, θ, is measured anticlockwise 极轴
The alignment of the polar axis and the monitoring of the guiding process require absolute accuracy.
极轴的摆放及追踪过程必须十分准确。
Because of its oblate shape, the moment of inertia of the earth is a maximum about the polar axis and minimum about an axis in the equatorial plane.
由于地球是扁球体，绕极轴惯量矩最大，而绕在赤道面内的轴的惯量矩最。
A system of coordinates in which a point is located by its distance and direction (Angle) from a fixed point on a reference line (called the polar axis).
一种用点离基准线上(称极轴)固定点的距离和方向(角度)来表示点位置的坐标系统。
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