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过点(0,3)作直线l,若l与曲线x2-y2=4只有一个公共点,这样的直线l共有...
过点(0,3)作直线l,若l与曲线x2-y2=4只有一个公共点,这样的直线l共有( )
A.一条
B.二条
C.三条
D.四条
考点分析:
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A.
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B.
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C.
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D.2
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已知双曲线的离心率为2,焦点是(-4,0),(4,0),则双曲线方程为( )
A.
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B.
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C.
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D.
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已知椭圆的长轴长是短轴长的2倍,则椭圆的离心率等于( )
A.
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B.
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C.
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D.
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观察下面的圆锥曲线,其中离心率最小的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119850148/SYS201311012248491198501002_ST/images0.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119850148/SYS201311012248491198501002_ST/images2.png)
D.
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椭圆
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+
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=1上一点p到一个焦点的距离为5,则p到另一个焦点的距离为( )
A.5
B.6
C.4
D.10
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