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含有________的类称为抽象类，不能直接用它实例化对象。
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含有________的类称为抽象类，不能直接用它实例化对象。
A、纯虚函数
B、虚函数
C、静态成员
D、友元
时间：2021-09-01 23:51
关键词：
青书学堂
大连工业大学
C语言下
答案解析
A
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