Optimal maintenance policy problem in a system is discussed and analysed in this paper. Due to the random variable concerned, one objective mathematical model of expectation value is developed.
本文讨论了系统的最优维修策略问题，考虑到题目中所涉及的变量大多为随机变量，我们建立了单目标的期望值模型。
Therefore, the audience's expectation of optimal relevance is a crucial pragmatic factor.
因此，受众的期待最佳相关是关键因素。
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