在某银行业务的用例模型中，“取款”用例需要等到“存款”用例执行之后才能执行，两个用例之间的关系属于（ ）；“取款”和“存款”两个用例中都需要执行查询余额的功能，将查询余额提取成独立的用例，那么“取款”和“存款”用例与“查询余额”用例之间的关系属于（ ）。
问题1选项
A.关联关系
B.扩展关系
C.使用关系
D.依赖关系
问题2选项
A.扩展关系
B.使用关系
C.依赖关系
D.继承关系
正确答案及解析
正确答案
解析
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