如图所示，已知AB=AC，PB=PC，下面的结论：①BE=CE；②AP⊥BC；③AE平

如图所示，已知AB=AC，PB=PC，下面的结论：①BE=CE；②AP⊥BC；③AE平分∠BEC；④∠PEC=∠PCE，其中正确结论的个数有（）

A．1个 B．2个 C．3个 D．4个

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解析:略

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如图所示，已知AB=AC，PB=PC，下面的结论：①BE=CE；②AP⊥BC；③AE平

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