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AB为⊙O的直径,弦CD⊥AB于点M,过点B作BE∥CD,交AC的延长线于点E,...
AB为⊙O的直径,弦CD⊥AB于点M,过点B作BE∥CD,交AC的延长线于点E,连接BC,如果CD=6,
tan∠BCD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123091207878/SYS201311011901230912078009_ST/0.png)
,则⊙O的直径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123091207878/SYS201311011901230912078009_ST/images1.png)
A.9
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123091207878/SYS201311011901230912078009_ST/1.png)
C.3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123091207878/SYS201311011901230912078009_ST/2.png)
D.10
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