题目内容

在UML中， (16) 把活动图中的活动划分为若干组，并将划分的组指定给对象，这些对象必须履行该组所包括的活动，它能够明确地表示哪些活动是由哪些对象完成的。

A. 组合活动
B. 同步条
C. 活动
D. 泳道

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