第五章 面向对象分析--5.2 用例图【含答案】 软件工程

(1)单选题

Which of the following statements is correct?

A  In a use case diagram, the actors cannot have relationship between each other.

B  In a use case diagram, the sub-actor can inherit its super-actor's relationships with use cases.

C  In a use case diagram, the more relationships between use cases the better.

D  The relationship of "extension" and "generalization" are the same, they can take each other's place.

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