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【简答题】
定义 object 类,有 weight 属性及相应的操作函数,由此派生出 box 类,增加 Height 和 width 属性及相应的操作函数,声明一个 box 对象,观察构造函数与析构函数的调用顺序。
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皮皮学刷刷变学霸
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【简答题】已知点P（x，y）在圆x 2 +（y-1） 2 =1上运动。 （1）求 的最大值与最小值； （2）求2x+y的最大值与最小值。
【单选题】Have you ever been afraid to talk back when you were treated unfairly? Have you ever bought something just because the salesman talked you into it? Are you afraid to ask someone for a date? Many peopl...
A.
they have a poor self-image
B.
they have not received AT courses
C.
they have not grasped communication skills
D.
they are not generous enough to share things