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已知圆O的半径为1,PA、PB为该圆的两条切线,A、B为俩切点,那么的最小值为(...
已知圆O的半径为1,PA、PB为该圆的两条切线,A、B为俩切点,那么
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650791371/SYS201311012314266507913011_ST/0.png)
的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650791371/SYS201311012314266507913011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650791371/SYS201311012314266507913011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650791371/SYS201311012314266507913011_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650791371/SYS201311012314266507913011_ST/4.png)
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