The simple truth is that there is an optimum rate of replacement, a best time for replacement.
道理很简单，厂房、设备都有最适当的折旧率，也就是最佳的更新年限。
The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum age replacement decision is also discussed.
在建立数学模型的基础上，分析了系统长期单位时间内的期望费用，并讨论了最优年龄替换决策。
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