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(2009•长沙)如图,矩形ABCD的两条对角线相交于点O,∠AOB=60°,A...
(2009•长沙)如图,矩形ABCD的两条对角线相交于点O,∠AOB=60°,AB=2,则矩形的对角线AC的长是( )
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A.2
B.4
C.2
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D.4
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