如圖，Rt△ABC中，AB⊥AC，AD⊥BC，BE平分∠ABC，交AD于E，EF∥AC，下列結論一定成立的是____________(填序號)①AB=BF②AE=ED③AD=DC④∠ABE=∠DFE

如圖，Rt△ABC中，AB⊥AC，AD⊥BC，BE平分∠ABC，交AD于E，EF∥AC，下列結論一定成立的是

1. A.
   AB=BF
2. B.
   AE=ED
3. C.
   AD=DC
4. D.
   ∠ABE=∠DFE

如圖，Rt△ABC中，AB⊥AC，AD⊥BC，BE平分∠ABC，交AD于E，EF∥AC，下列結論一定成立的是____________(填序號)①AB=BF②AE=ED③AD=DC④∠ABE=∠DFE