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已知集合A={x|-1≤x≤8},B={x|m+3<x<3m-1}且B≠∅,若A...
已知集合A={x|-1≤x≤8},B={x|m+3<x<3m-1}且B≠∅,若A∪B=A,则( )
A.-4≤m≤3
B.-4<m<3
C.2<m≤3
D.2<m<3
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下列表示错误的是( )
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B.∅⊆{1,2}
C.
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