This is the ticket pre-sale system, detailed and contains a data flow diagram such as Figure multiple systems.

Packet : 69491707train.rar filelist
火车票预售系统\E-R图.vsd
火车票预售系统\leiyulu.doc
火车票预售系统\任务书.doc
火车票预售系统\关联图.vsd
火车票预售系统\数据流图.vsd
火车票预售系统\用例图.vsd
火车票预售系统

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