A.What time is it?
B.Is that the garden?
C. Is it warm today?
D.Where is the library?
E.What's the weather like today?
如图:已知在△ABC中,AB=AC,D为BC边的中点,过点D作DE⊥AB,DF⊥AC,垂足分别为E,F.求证:△BED≌△CFD.
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圆有无数条对称轴.