如下所示的UML图中，（I）是（ ），（Ⅱ）是（ ），（Ⅲ）是（请作答此空）。
- A.参与者
- B.用例
- C.泛化关系
- D.包含关系
正确答案及解析
正确答案
解析
本题考查统一建模语言（UML）的基本知识。
用例图（use case diagram）展现了一组用例、参与者（Actor）以及它们之间的关系。用例图通常包括用例、参与者，以及用例之间的扩展关系（＜＜extend>>）和包含关系（＜＜include>>），参与者和用例之间的关联关系，用例与用例以及参与者与参与者之间的泛化关系。如下图所示。
用例图用于对系统的静态用例视图进行建模，主要支持系统的行为，即该系统在它的周边环境的语境中所提供的外部可见服务。
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