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(2007•台湾)如图,不等长的两对角线AC、BD相交于O点,且将四边形ABCD...
(2007•台湾)如图,不等长的两对角线AC、BD相交于O点,且将四边形ABCD分成甲、乙、丙、丁四个三角形.若OA:OC=OB:OD=1:2,则此四个三角形的关系,下列叙述何者正确( )
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A.甲丙相似,乙丁相似
B.甲丙相似,乙丁不相似
C.甲丙不相似,乙丁相似
D.甲丙不相似,乙丁不相似
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的比值为( )
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A.
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B.
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C.
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D.
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