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问题详情

设A={{1,2,3}, {4,5}, {6,7,8}}，下列哪个式子为真（）

A、1∈A

B、{1,2,3}⊆A

C、{{4,5}}⊂A

时间：2021-09-01 20:46 关键词：联大河南理工大学计算机科学与技术离散数学

答案解析

C

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