文件名称:3
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随机读写文件
写入5个学生记录，记录内容为学生姓名、学号、两科成绩。写入成功后，随机读取第三条记录，并用第二条记录替换。
-Random read and write document write five student records, records of the content for students name, student number, the two subjects. Write successful, random read a third record, and record a second replacement.
写入5个学生记录，记录内容为学生姓名、学号、两科成绩。写入成功后，随机读取第三条记录，并用第二条记录替换。
-Random read and write document write five student records, records of the content for students name, student number, the two subjects. Write successful, random read a third record, and record a second replacement.
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新建 文本文档 (2).txt