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●设类Derived是类Base的一个子类,则Derived中(45)。(45)

单选题
2022-03-05 21:43
A、只有Base的属性
B、只有Base的方法
C、除Base中的属性和方法外,只能添加Base中没有的新方法
D、除Base中的属性和方法外,还可以添加新属性和新方法
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正确答案
D

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