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如图,已知菱形ABCD中,对角线AC与BD相交于点O,OE∥DC,交BC于点E,...
如图,已知菱形ABCD中,对角线AC与BD相交于点O,OE∥DC,交BC于点E,AD=6cm,则OE的长为( )
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A.6 cm
B.4 cm
C.3 cm
D.2 cm
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