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功能模型中所有的(24)往往形成一个层次结构。在这个层次结构中一个数据流图的过程可以由一层数据流图做进下一步的说明。

  • A.数据流图
  • B.概念模型图
  • C.状态迁移图
  • D.事件追踪图
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