通过对零件拓扑面建立编码，提出了虚拟零件和虚拟元素的概念，建立了虚拟零件模型；
The concept of the virtual part and virtual component are proposed and the virtual part model is built up by coding the faces of parts.
通过对零件拓扑面建立编码，提出了虚拟零件和虚拟元素的概念，建立了虚拟零件模型；
The concept of the virtual part and virtual component are proposed and the virtual part model is built up by coding the faces of parts.
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