很好很实用的介绍关于用例图的文章，挺全面的。

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基于WEB的远程实验平台设计与实现 web组态-WEB-based remote experiment platform design and implementation of web configuration

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用贪心算法，求解最短路径问题； 通过根据当前的最优情况，选择最好的节点；-greedy alogith ,in order to get the best result for the station of the matter