A:苍桑伶俜屈指可数鞠躬尽粹
B:脉膊涣散欢渡良宵汗流夹背
C:喝彩毛燥金榜提名再接再励
D:商榷撕杀各行其事融汇贯通
如图,矩形ABCD的对角线相交于点O,AE平分∠BAD交BC于E,若∠CAE=15°,则∠AEO=( )
We haven't seen her for many days and there is ______ for her safety.
① 角的大小与角两边的长短无关;
② 过两点有且只有一条直线;
③ 若线段AP=BP,则P一定是AB中点;
④ A与B两点间的距离是指连接A、B两点间的线段.