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(2001•绍兴)如图,⊙O中,直径CD垂直于弦AB于点E,若AB=4,CE=1...
(2001•绍兴)如图,⊙O中,直径CD垂直于弦AB于点E,若AB=4,CE=1,则⊙O的半径是( )
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A.2
B.2.5
C.3
D.3.5
考点分析:
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