1. 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种证明方法.
2. 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种证明方法。

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