Studies application of matric method to deal with fixed point rotation of rigid body, and infers instantaneous axis equation.
介绍了用矩阵讨论刚体定点转动瞬轴的方法，在此基础上推导出转动瞬轴方程。
Computation of the magnetic field, which is produced by a charged body rotating about a fixed axis, is a classical question about magnetostatic boundary-value problem.
求定轴匀角速转动带电体的磁场是一类典型的静磁场边值问题。
The main light-emitting diodes are fixed to the light body in such a way that the optical axes thereof cross the light axis in the center of a light spot.
多个主发光二极管固定在照明本体上，以这样的方式它们的光轴与光轴在照明区的中心交叉。
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