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问题详情

设集合A={{1,2,3}, {4,5}, {6,7,8}},则下式为真的是( )

A、1A

B、{1,2, 3}A

C、 {{4,5}}A

时间：2021-09-01 17:03 关键词：青书学堂平顶山学院计算机科学与技术离散数学

答案解析

C

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