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设一个集合A={3，4，5，6，7}，集合B={l，3，5，7，9}，则A减B的差集中包含有( )个元素。

A、10.0

B、5.0

C、3.0

D、2.0

时间：2021-07-17 23:25 关键词：计算机网络技术高起专关系型数据库期末考试

答案解析

D

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