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(2010•红河州)如图,已知BD是⊙O的直径,⊙O的弦AC⊥BD于点E,若∠A...
(2010•红河州)如图,已知BD是⊙O的直径,⊙O的弦AC⊥BD于点E,若∠AOD=60°,则∠DBC的度数为( )
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A.30°
B.40°
C.50°
D.60°
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