子类应是对基类的扩展。子类可以添加新的成员,但不能出去已经继承的成员的定义。()
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每个时代、每个民族的荣辱观,归根结底是由那个时代那个民族生产力发展水平决定的。()
What is indicated about Mr. Russel?
A. He is collaborating on a project.
B. He is purchasing a travel guide book.
C. He is drafting a research proposal.
D. He is attending a book fair.