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已知点A(-3,1,-4),则点A关于y轴对称的点的坐标为 .
已知点A(-3,1,-4),则点A关于y轴对称的点的坐标为 .
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过抛物线y=ax
2(a>0)的焦点F作一直线交抛物线于P、Q两点,若线段PF与FQ的长分别是p、q,则
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+
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等于( )
A.2a
B.
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C.4a
D.
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下列等式中,使点M与点A、B、C一定共面的是( )
A.
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B.
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C.
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D.
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已知
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由他们构成的新命题:“﹁p”,“﹁q”,“p∧q”,“p∨q”中,真命题有( )
A.1个
B.2个
C.3个
D.4个
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双曲线
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右支点上的一点P到右焦点的距离为2,则P点到左准线的距离为( )
A.6
B.8
C.10
D.12
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