...型，但是大致上所使用之零 件种类、数量、品质水准及使用环境条件等必要条件都已初步确定，此时即可应 用零件计数（Part count）法来预估产品的可靠度水准。
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从零件加工成本与公差关系的现有统计数据拟合得到普遍表达式用于本模型。
A general expression relating the cost of component processing to the tolerance is obtained by fitting to existing data.
定期更新故障机器，零件或工装准备的统计数据，为规划具体的改善行动作准备。
Prepare and regularly up-date statistics of failure of machines parts or tooling, in order to plan specific improvement actions.
本文介绍了用PTC8253-5实现机加零件自动包装计数定时的设计，给出了硬件电路和软件程序。
This paper introduces the design of counting and timing device for automated machine-made spares packing with PTC8253-5. The hardware circuit and software are given.
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