题目：
Which of the following statements about object oriented database is not correct
A．Each object has a unique object identity in the syste
B．Encapsulation and inheritance are two important features of object oriented database
C．A subclass can inherit the attributes and methods of all its superclasses
D．A superclass includes the attributes and methods of all its subclasses
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
