．如图,直线AB和直线CD交于点O, EO⊥CD, 垂足为O,则∠AOE和∠DOB的关系是______________.

．如图,直线AB和直线CD交于点O, EO⊥CD, 垂足为O,则∠AOE和∠DOB的关系是______________.

如图，直线AB、CD交于O，EO⊥AB于O，∠1与∠2的关系是(    ) 

A.互余              B.对顶角                C.互补              D.相等