对空间第一组机构回路问题进行了研究。
最后由空间第一类机构与球面四杆机构的等效性，阐述了将此识别方法应用于第一组空间机构的方法。
Rotation angle symbol method to identify circuit and branch of spherical four bar is presented in this paper. Finally, the method about application to spatial first group mechanism is elaborated.
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