题干

如图EB交AC于M,交FC于D,AB交FC于N,∠E=∠F=90°,∠B=∠C,AE=AF.给出下列结论:①∠1=∠2;②BE=CF;③△ACN≌△ABM;④CD=DN.其中正确的结论有____(填序号).

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①②③

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                                                                                                 小小的花,
                                                                                                 也想抬起头来,
                                                                                                 感谢春光的爱——
                                                                                                 然而深厚的恩慈,
                                                                                                 反使她终于沉默。
                                                                                                 母亲啊!
                                                                                                 你是那春光吗?