通过引入一个虚拟决策单元，设计了交通运输项目改进DEA评价模型，并给出了评价案例。

By incorporating a fictitious DMU, this paper presents an improved model of DEA for transportation projects with an example.

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决策层是一个任务规划单元；

Decision level is a task-planning unit;

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决策层是一个任务规划单元；

Decision level is a task-planning unit;

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