If a torque is applied to the disk in such a fashion that the axis of the torque is the same as that of rotation of the disk, the direction of the former will be parallel to AB.
如果力矩是这样地作用于一圆盘上，即力矩的轴与圆盘的旋转轴方向一致，则力矩的方向与ab线平行。
AB inverse direction with coordinate azimuth coordinates.
用坐标反算ab方向的坐标方位角。
AB inverse direction with coordinate azimuth coordinates.
用坐标反算ab方向的坐标方位角。
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