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已知O是△ABC所在平面内一点,D为BC边中点,且,那么( ) A. B. C....
已知O是△ABC所在平面内一点,D为BC边中点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183623856374231/SYS201310241836238563742004_ST/0.png)
,那么( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183623856374231/SYS201310241836238563742004_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183623856374231/SYS201310241836238563742004_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183623856374231/SYS201310241836238563742004_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183623856374231/SYS201310241836238563742004_ST/4.png)
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