问题:
如图,AB∥DF,AC⊥BC于C,BC与DF交于点E,若∠A=20°,则∠CEF等于
[ ]
A.110°
B.100°
C.80°
D.70°
如图,AB∥DF,AC⊥BC于C,BC与DF交于点E,若∠A=20°,则∠CEF等于
B.100°
C.80°
D.70°
[ ]
A.110° B.100°
C.80°
D.70°
参考答案: