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C肽

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What does the speaker think of following a doctor’s advice？Following a doctor’s advice is not always （）.

5（）

A. Take another interview.
B. Work with his father.
C. Start his own company.
D. Stay at the present job.

【问题3】关联(Association)和聚集(Aggregation)是UML中两种非常重要的关系。请说明关联和聚集的关系，并说明其不同点。

简述教师威信形成的主要条件。