题目内容

What does the teacher show in front of her students?

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Why does the teacher say no one needs to own a van Gogh original?

What does the teacher wish her students to do by introducing Van Gogh by numbers?

Why is the teacher angry with Mrs. Jones?

实现工厂模式时返回对象可以是抽象对象，也可以是（）。

A. 具体对象
B. 设计对象
C. 代理对象
D. 操作对象