这是与z正轴的夹角。
肩髋夹角呈现由小到大再变小的规律；
The shoulder hip intersection angle appears from minor to changing greatly again law;
上反角，机翼基准面与水线之间的夹角。
DIHEDRAL, the Angle between the wing reference plane and water line.
驱动轴与缸体轴线夹角可达到25o，排量大；
在同一铅垂面内，当视线在水平线上方时，视线与水平线的夹角。
Trying on drilling with high water level and large elevation angle;
在同一铅垂面内，当视线在水平线上方时，视线与水平线的夹角。
Trying on drilling with high water level and large elevation angle;
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