In this paper we begin from the feature of the assembly and disassembly modeling in the virtual maintenance, propose a layering method to assembly and disassembly modeling building.
本文从虚拟维修中装配拆卸模型的基本特点入手，给出了在进行虚拟维修中所需要的模型的层次化组织结构。
Disassembly and assembly are quick and easy. Maintenance time is reduced.
拆卸和组装方便快捷，维修时间缩短。
The electric door operator box has the advantages of simplifying the structure of the electric door and being more convenient in assembly, disassembly and maintenance.
本实用新型的优点在于开门机结构简单，装配拆卸维修更加方便。
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