题目：
使用已经存在的类作为基础建立新类的定义，这种技术叫做类的______。
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
使用已经存在的类作为基础建立新类的定义，这种技术叫做类的______。
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