The similarity principle used in grouping is the key element of the derivative CAPP system, the grouping results is reasonable effects on the valid working of the derivative CAPP system.
利用零件的相似性原理对零件分组是派生式CAPP系统的重要内容，对零件的分组是否合理，直接影响到派生式CAPP系统能否正常运行。
The part classified codification is a core element to achieve derivative CAPP or generated CAPP.
零件分类编码是实现派生式或创成式CAPP的核心内容。
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