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
在平面平行运动时，瞬心的本极
间极间关系的一
证明方法.
间极
The relationship between polhode and herpolhode of the instant center of a rigid body when it makes a plane paraller motion is presented.
给出在平面平行运动时，瞬心的本极间极间关系的一证明方法.
A certification method to the relationship between polhode cone and herpolhode cone is given when the rigid body is in a fixed point motion.
摘要给出定点运动时本极面间极面间关系的一证明方法。
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