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(2008•海南)如图,AB是⊙O的直径,AC是⊙O的切线,A为切点,连接BC,...
(2008•海南)如图,AB是⊙O的直径,AC是⊙O的切线,A为切点,连接BC,若∠ABC=45°,则下列结论正确的是( )
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A.AC>AB
B.AC=AB
C.AC<AB
D.AC=
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BC
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