有向图的邻接矩阵比较容易建立，但是在建立结构模型时，更有用的是要素间的可达关系。
The Adjacency Matrix of the Directed Graph is easy to build, but the reach-relation of factors is more useful when building the structure model.
结构要素概念还可应用于CAPP系统的后续模块，且为工艺决策模型的建立以及工序图的自动输出提供了方便。
The structure element can also be used in following-up modules of CAPP system to simplify the process decision and the automatic output of operating. diagram.
结构要素概念还可应用于CAPP系统的后续模块，且为工艺决策模型的建立以及工序图的自动输出提供了方便。
The structure element can also be used in following-up modules of CAPP system to simplify the process decision and the automatic output of operating. d...
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