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问题:

● 某学校有多个班,每个班有多名学生但只能有一个班长,那么班长与学生这两 个实体之间的关系是 (5

● 某学校有多个班,每个班有多名学生但只能有一个班长,那么班长与学生这两 个实体之间的关系是 (57) 。

(57)A.1:1 B.1:n C.n:1 D.m:n


  参考答案

正确答案:B

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