问题
单项选择题
在用例建模的过程中，若几个用例执行了同样的功能步骤，这时可以把这些公共步骤提取成独立的用例。这种用例称为 (2) 。在UML的用例图上，将用例之间的这种关系标记为 (3) 。
A．扩展用例
B．抽象用例
C．公共用例
D．参与用例
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
在用例建模的过程中，若几个用例执行了同样的功能步骤，这时可以把这些公共步骤提取成独立的用例。这种用例称为 (2) 。在UML的用例图上，将用例之间的这种关系标记为 (3) 。
A．扩展用例
B．抽象用例
C．公共用例
D．参与用例
参考答案：B
| 用方框所给词填空，每词仅用一次。 | |
2. We are going to have a ______ for her birthday this evening. 3. His father bought him a ______ T-shirt. 4. Don' t ______. They are sleeping. 5. —Can you finish it on time? —No ______. 6. The teacher told us an ______ news. 7. It was getting dark when the plane ______ in New York. 8. I am lazy, but he is ______. 9. She was too ______ to buy clothes for her children. 10. —How did the accident ______? —I don' t know. |