According to a transfer approach of music score and PLC program, an auto-play system of electronic organ based on PLC was designed.

通过一种乐谱与PLC程序的转换方法，设计了基于PLC的电子琴自动演奏系统。

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Then extends the efficiency measurement to the stochastic situation based on the expected value approach and presents the definition of the expected efficiency score, and finally a instance is given.

进一步提出了随机条件下决策单元的期望有效性指数概念和相对有效性评价的期望值方法，最后给出了计算实例。

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Then extends the efficiency measurement to the stochastic situation based on the expected value approach and presents the definition of the expected efficiency score, and finally a instance is given.

进一步提出了随机条件下决策单元的期望有效性指数概念和相对有效性评价的期望值方法，最后给出了计算实例。

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