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已知命题p:∀x∈(1,+∞),log2x>0,则¬p为 .
已知命题p:∀x∈(1,+∞),log2x>0,则¬p为 .
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A.
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B.
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C.
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D.
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设l,m是不同的直线,α,β,γ,,是不同的平面,则下列说法中正确的是( )
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如图,在正方体ABCD-A
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若过椭圆
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(a>b>0)的焦点且垂直于x轴的直线被椭圆截得的线段长为
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,则该椭圆的离心率是( )
A.
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B.
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C.
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D.
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如图,正方体AC
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1、BD的中点,则直线AD
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A.
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B.
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C.
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D.
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