题目内容：
某人有三个儿子，组成集合A={S1,S2,S3},在A上的兄弟关系一定不是等价关系。
参考答案：
选择题：某人有三个儿子，组成集合A={S1,S2,S3},在A上的兄弟关系一定不是等价关系。
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