A:ask him
B:to ask him
C:that you ask him
D:asking him
如图,△ABC绕点A顺时针旋转80°得到△AEF,若∠B=100°,∠F=50°,则∠α的度数是( )
教室里的公物有( )。
有一串分数,11,12,22,12,13,23,33,23,13,14,24,34,44…请问710是第几个分数?第400个分数是几分之几?