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已知集合A={1,2,3} ，则A的1元子集的个数为（ ）。
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已知集合A={1,2,3} ，则A的1元子集的个数为（ ）。
A、1
B、2
C、3
D、4
时间：2021-07-17 23:20
关键词：
土木工程
高起本
线性代数
2019级第三学期期末考试
答案解析
C
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