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如图,弦CD垂直于⊙O的直径AB,垂足为H,且CD=,BD=,则AB的长为( )...
如图,弦CD垂直于⊙O的直径AB,垂足为H,且CD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100924204212145/SYS201311031009242042121019_ST/0.png)
,BD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100924204212145/SYS201311031009242042121019_ST/1.png)
,则AB的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100924204212145/SYS201311031009242042121019_ST/images2.png)
A.2
B.3
C.4
D.5
考点分析:
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