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(2000•兰州)有两个同心圆,大圆的直径AB交小圆于C、D,大圆的弦EF切小圆...
(2000•兰州)有两个同心圆,大圆的直径AB交小圆于C、D,大圆的弦EF切小圆于C点,ED交小圆于G点,若AO=6,CO=4,则EG等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232717094955226/SYS201310212327170949552005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232717094955226/SYS201310212327170949552005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232717094955226/SYS201310212327170949552005_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232717094955226/SYS201310212327170949552005_ST/3.png)
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