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提出一种改进的有色、时间Ｐｅｔｒｉ网——扩展有色、时间Ｐｅｔｒｉ网，有效解决了模型规模和信息显示容量之间的矛盾，图形简洁紧凑，内涵丰富，具有较强建模能力
An improved colored and timed Petri nets - extended colored and timed Petri nets is proposed, which effectively solves the contradiction between the model size and the information display capacity. The graph is concise and compact, has rich connotation and strong modeling ability