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(2003•台湾)如图所示,△ABC中,∠ABC=90°,O为△ABC的外心,∠...
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(2003•台湾)如图所示,△ABC中,∠ABC=90°,O为△ABC的外心,∠C=60°,BC=2.若△AOB面积=a,△OBC面积=b,则下列叙述何者正确( )
A.a>b
B.a<b
C.a-b=0
D.a+b=4
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