Fig. 37.1 is a general representation of an open-loop control system.
图37.1是对开环控制系统的一般性表示。
Until now, there is no general representation for 3d topological structure, especially topological relationships between 3d solid objects.
目前还没有通用的方法表示三维空间拓扑结构，尤其是三维体对象之间的拓扑关系。
Until now, there is no general representation for 3d topological structure, especially topological relationships between 3d solid objects.
目前还没有通用的方法表示三维空间拓扑结构，尤其是三维体对象之间的拓扑关系。
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