The relationship between polhode and herpolhode of the instant center of a rigid body when it makes a plane paraller motion is presented.
给出了刚体在平面平行运动时，刚体瞬心的本体极迹与空间极迹间关系的一
证明
法.
The relationship between polhode and herpolhode of the instant center of a rigid body when it makes a plane paraller motion is presented.
给出了刚体在平面平行运动时，刚体瞬心的本体极迹与空间极迹间关系的一证明法.
A certification method to the relationship between polhode cone and herpolhode cone is given when the rigid body is in a fixed point motion.
摘要给出了刚体定点运动时本体极面与空间极面间关系的一证明法。
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