机械零件加工中假废品的判断 关键词： 测量基准；设计基准；假废品 [gap=2323]Key Words: measure datum;design datum;false waste products
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Fine datum choice: Must conform to the datum superposition principle, chooses the design datum or the assembly datum as far as possible takes the localization datum.
精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基准。
My advice is to think carefully at the design stage about whether a singular datum might have siblings later on.
我的建议是，在设计阶段，就单个数据是否在以后需要多个兄弟数据，要仔细考虑。
The final ERD (entity relationship model diagram) and system datum dictionary are given through data sheets normalization during logic design and physical design.
在逻辑设计与物理设计过程中通过数据规范化后得出最终的ER模型图并给出系统数据字典。
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