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在一次某高校的招生面试会上,有A、B、C、D四个高校设摊要从6名应试者中各招收且...
在一次某高校的招生面试会上,有A、B、C、D四个高校设摊要从6名应试者中各招收且必招收一名学生,若甲、乙两人都不能被A高校录取,且每人只能被一个高校录取或不被录取,则不同的录取方法共有 种(用数字作答).
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的一条渐近线与抛物线y=x
2+1只有一个公共点,则双曲线的离心率为( )
A.
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B.5
C.
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D.
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将函数
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的图象按向量
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平移所得的图象关于y轴对称,则m最小正值是( )
A.
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B.
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C.
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D.
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四面体中,有同一个面上的两条棱长为
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,其余棱长全为1时,它的体积为( )
A.
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B.
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C.
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D.以上全不正确
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已知随机变量ξ服从正态分布N(2,σ
2),P(ξ≤4)=0.84,则P(ξ≤0)=( )
A.0.16
B.0.32
C.0.68
D.0.84
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设向量
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,则下列为
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与
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共线的充要条件的有( )
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或
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; ②
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;
③
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; ④
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.
A.1个
B.2个
C.3个
D.4个
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