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.
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。
Compared to standard point symbol, the oriented-point symbol contains direction Angle information.
相对于标准点符号，有向点符号包含着方向角信息。
The cartograph plan design and the symbol design optimized question at an angle of quantification are discussed, and an example is given.
为了向用图者较好地传递统计数据信息，从量化的角度探讨了对统计地图的图面设计和符号设计的优化问题，并在一个实例中加以实现。
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