文件名称:2.5
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（学生类设计）.设计一个友元函数，按
照成绩从高到低的顺序输出姓名、学号和成绩信息。-( the student class design ). Designing a friend function, according to the results from high to low order output name, student ID and performance information.
照成绩从高到低的顺序输出姓名、学号和成绩信息。-( the student class design ). Designing a friend function, according to the results from high to low order output name, student ID and performance information.
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2.5.cpp