The agereplacement decision for the system with intermittently used equipment is studied in this paper.
研究了设备间歇使用系统的年龄替换决策。
2
The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum agereplacement 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。
3
Scientists believe the secret to the clams' longevity is a slowed cell-replacement process. But why they age so slowly is unknown.