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已知抛物线M:y2=4x,圆N:(x-1)2+y2=r2(其中r为常数,r>0)...
已知抛物线M:y
2=4x,圆N:(x-1)
2+y
2=r
2(其中r为常数,r>0).过点(1,0)的直线l交圆N于C、D两点,交抛物线M于A、B两点,且满足|AC|=|BD|的直线l只有三条的必要条件是( )
A.r∈(0,1]
B.r∈(1,2]
C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123656965151908/SYS201310251236569651519007_ST/1.png)
考点分析:
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