面向对象的软件开发过程是用例驱动的，用例是UML的重要部分，用例之间存在着一定的关系，下图表示的是用例之间的 （ ） 关系。
- A.泛化
- B.包含
- C.扩展
- D.等同
正确答案及解析
正确答案
解析
泛化关系：当多个用例共同拥有一种类似的结构和行为时，可以将他们的共性抽象成为父用例。如：
扩展关系与包含关系的区别是：离开子用例，基用例是否可以完成一个完整的功能。显然题目中对于基用例“取款机的使用”需要“识别用户”和“验证账号”这二个子用例才够完整，而这二个子用例也必然会被执行。若是子用例是“打印凭条”，则它是否被执行都不会影响“取款机使用”。
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