文件名称:jian
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A输入任意的一个课程名(如数学)和一个分数段(如60--70),统计出在此分数段的学生情况。
-A put any of A class name (such as math) and A band (such as 60-70), statistics A in this band of the students.
-A put any of A class name (such as math) and A band (such as 60-70), statistics A in this band of the students.
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