题目

如图，△ABC中，AB=AC，AD⊥BC，CE⊥AB，AE=CE．求证：                     （1）△AEF≌△CEB；                                                                             （2）AF=2CD．                                                                                                                                                    �下列哪条经线是地球上昨天与今天的分界线，简称国际日期变更线A．160°E B．20°W C．赤道 D．180°