已知集合，，则{"A":"","B":"","C":"","D":"R"}_刷题宝

题干

已知集合

，

，则

A：

B：

C：

D：R

上一题下一题 0.0难度选择题更新时间:2012-07-17 05:18:22

答案(点此获取答案解析）

B

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