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。
The forest model is composed of a layer of discrete random different types of non-spherical particles, including the type of trunk, main branch, often sprawling and leaves.
森林模型是由一层离散随机的不同种类的非球形粒子构成，非球形粒子的种类要区分树干、主枝、旁枝和树叶。
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