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(2003•武汉)已知:如图,AB为⊙O的直径,CD、CB为⊙O的切线,D、B为...
(2003•武汉)已知:如图,AB为⊙O的直径,CD、CB为⊙O的切线,D、B为切点,OC交⊙O于点E,AE的延长线交BC于点F,连接AD、BD.以下结论:①AD∥OC;②点E为△CDB的内心;③FC=FE;④CE•FB=AB•CF.其中正确的只有( )
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A.①②
B.②③④
C.①③④
D.①②④
考点分析:
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