问题
填空题
一个抽象类的派生类可以实例化的必需条件是实现了所有的 [15] 。
答案
参考答案：纯虚函数
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一个抽象类的派生类可以实例化的必需条件是实现了所有的 [15] 。
参考答案：纯虚函数
I have a big and happy family. My grandparents 1 workers. 2 are old now. My father is a doctor. He can swim well. My 3 is a teacher. She likes eating 4 and vegetables. I have got 5 uncle. He is a manager. He’s got 6 bikes in his factory. He can drive. He 7 swim. I’m Betty. I’m a student. I’m 8 Class 5. I can run fast 9 I can’t sing well. My faourite drink is 10 . 小题1:.
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