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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( )。
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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( )。
A、自反的
B、对称的
C、反对称的
D、传递的
时间：2021-07-17 22:44
关键词：
计算机应用技术
高起专
离散数学
期末考试
综合作业
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B
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