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如图,在Rt△ABC中,AB=CB,BO⊥AC,把△ABC折叠,使AB落在AC上...
如图,在Rt△ABC中,AB=CB,BO⊥AC,把△ABC折叠,使AB落在AC上,点B与AC上的点E重合,展开后,折痕AD交BO于点F,连接DE、EF.下列结论:①tan∠ADB=2;②图中有4对全等三角形;③若将△DEF沿EF折叠,则点D不一定落在AC上;④BD=BF;⑤S
四边形DFOE=S
△AOF,上述结论中正确的个数是( )
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A.1个
B.2个
C.3个
D.4个
考点分析:
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