Based on summary and analysis of the actual conditions of post enterprises, this paper proposes two models of making time limit standard for mail transmission.

本文从总结和分析邮政企业的实际情况出发，探讨了制定邮件传递时限标准的两种模式。

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Based on the commissioning lessons in various plants and reliability centralized analysis, the paper analyzes the approaches to optimize the time limit of commissioning with logic diagram.

本文基于可靠性分析方法，参考各电厂调试经验，采用逻辑分析图对优化调试工期的方法进行了分析。

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Based on the security time limit theory, the calculation method for the consumption amount of the appointed time and some examples of reliability analysis were presented.

基于“安全期限理论”，提出了直升机使用期限消耗量的计算方法，并进行了实例的可靠性分析。

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