题目内容

[集合与充要条件]已知集合A=[0,3],B=(-1,1],则A∪B= .

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[集合与充要条件]集合{1,2,3}的真子集共有( )个

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[集合与充要条件]集合A=(-1,3],B=(1,5), 则A∩B=( )

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The bridge___________ last year.

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A. used
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