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_________

[A] searching

[B] strolling

[C] crowding

[D] wandering


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考题 3、A、B、C、D为任意集合,以下正确的是A.(A∪B)´(C∪D) = (A´C)∪(B´D)B.(A-B)´(C-D) = (A´C)-(B´D)C.(A∩B)´(C∩D) = (A´C)∩(B´D)D.(AÅB)´(CÅD) = (A´C) Å (B´D)

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