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问题:
[单选] 设集合M={X∈R|X≤-1},集合N={∈R|Z≥-3},则集合MnN=( )
A . {X∈R|一3≤X≤-1}
B . {Z∈R|Z≤-1}
C . {X∈R|X≥一3}
D . φ
参考答案:
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参考解析
本题暂无解析
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