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如图所示,直线PA,PB是⊙O的两条切线,A,B分别为切点,∠APB=120°,...
如图所示,直线PA,PB是⊙O的两条切线,A,B分别为切点,∠APB=120°,OP=10cm,则弦AB的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102347004785073/SYS201311031023470047850011_ST/images0.png)
A.5
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102347004785073/SYS201311031023470047850011_ST/0.png)
cm
B.5cm
C.10
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102347004785073/SYS201311031023470047850011_ST/1.png)
cm
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102347004785073/SYS201311031023470047850011_ST/2.png)
cm
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