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设集合A={a,b,c,d},现有A上的二元关系R={<a,b>,<b,c>,<c,b>,<b,a>},则A是( )。

单选题
2021-07-17 22:44
A、自反的
B、对称的
C、反对称的
D、传递的
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正确答案
B

试题解析

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