题目内容
Data encapsulation is an example of:
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without __________________, the definition of an object as an instantiation（实例）of an Abstract Data Type is too simplistic（简单化）.
Parent is a ____________ of HumanBeing.
___________ refers to the components（组件） of a class:
The relationship of some kind between two apparently unrelated classes is referred to as a(n):
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