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若点A(-2,0)和点B(4,8)到直线l的距离等于4,则直线l的条数是( ) ...
若点A(-2,0)和点B(4,8)到直线l的距离等于4,则直线l的条数是( )
A.1
B.2
C.3
D.4
考点分析:
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、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936722059088/SYS201311031019367220590017_ST/1.png)
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是任意的非零平面向量,且互不平行,则下列四个命题中的真命题是( )
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936722059088/SYS201311031019367220590017_ST/3.png)
; ②
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;
③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936722059088/SYS201311031019367220590017_ST/5.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101936722059088/SYS201311031019367220590017_ST/6.png)
垂直; ④
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⇔λ=0,μ=0(λ,μ为实数).
A.①②③
B.②③④
C.①③④
D.①②③④
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