（ ）是一种很强的“拥有”关系，“部分”和“整体”的生命周期通常一样。整体对象完全支配其组成部分，包括它们的创建和销毁等;（ ）同样表示“拥有”关系，但有时候“部分”对象可以在不同的“整体”对象之间共享，并且“部分”对象的生命周期也可以与“整体”对象不同，甚至“部分”对象可以脱离“整体”对象而单独存在。上述两种关系都是（ ）关系的特殊种类。
问题1选项
A.聚合
B.组合
C.继承
D.关联
问题2选项
A.聚合
B.组合
C.继承
D.关联
问题3选项
A.聚合
B.组合
C.继承
D.关联
正确答案及解析
正确答案
解析
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