The relationship between polhode and herpolhode of the instant center of a rigid body when it makes a plane paraller motion is presented.
给出了刚
面行运动时，刚瞬心的本极迹与空
极迹
的一
证明方法.
极迹The relationship between polhode and herpolhode of the instant center of a rigid body when it makes a plane paraller motion is presented.
给出了刚面行运动时，刚瞬心的本极迹与空极迹的一证明方法.
A certification method to the relationship between polhode cone and herpolhode cone is given when the rigid body is in a fixed point motion.
摘要给出了刚定点运动时本极面与空极面的一证明方法。
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