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(2000•朝阳区)如图,P是⊙O外一点,PAB、PCD都是⊙O的割线.如果PA...
(2000•朝阳区)如图,P是⊙O外一点,PAB、PCD都是⊙O的割线.如果PA=4,AB=2,PC=CD,那么PD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992388113/SYS201310212327249923881014_ST/images0.png)
A.
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B.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992388113/SYS201310212327249923881014_ST/1.png)
C.3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992388113/SYS201310212327249923881014_ST/2.png)
D.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992388113/SYS201310212327249923881014_ST/3.png)
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