自定义了混凝土结构基本构件的图形对象模型， 讨论了图形对象间的 基本关系、 通知 响应机制、 约束的分类和实现、 特征识别和抽取以及基本构件三维重构的方式， 并 在此基础上实现了一个基于图形编辑的混凝土结构基本构件 )*+系统,该系统能够在

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混凝土结构基本构件CAD系统设计.pdf

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