O就是M解:如图,延长CE交BA延长线于F,∵∠ABE=∠CBE,BE=BE,∴Rt△FBE≌Rt△CBE,∴CE=EF,CE= CF,又∵∠ACF=90°-∠F=∠ABD,AB=AC,∴Rt△ABD≌Rt△ACF,∴BD=CF,在△ABM中,∠BAM=45°>∠ABM,∴BM>AM,在△AMD中,∠ADM>45°=∠DAM,∴AM>MD,∴BM>MD,∴BM> BD= CF=CE.故此题答案为BM>CE.