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(2002•包头)如图,⊙O的直径AB=10,E是OB上一点,弦CD过点E,且B...
(2002•包头)如图,⊙O的直径AB=10,E是OB上一点,弦CD过点E,且BE=2,DE=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768596924/SYS201310212325507685969011_ST/0.png)
,则弦心距OF为( )
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A.1
B.
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C.
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D.
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