通过工作时间的合理分配，优化待分析样品的组合，保持合理的分析周期。

By rationalize time allocation, optimizing combination the samples in hand, to keeping the reasonable lead time.

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利用在更换周期点上具有的马尔可夫性质，以系统首次故障前平均工作时间最大为目标建立了确定最佳更换周期的模型。

Using the property of Markov at the points of replacement period, a model of determining the optimal period is developed with objective of maximizing the mean time to first failure of system.

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