问题:
如图,∠DOB=140°,OA⊥OB,则∠AOC=
A.40°
B.45°
C.50°
D.55°
如图,∠DOB=140°,OA⊥OB,则∠AOC=
A.40°
B.45°
C.50°
D.55°
A.40°
B.45°
C.50°
D.55°
参考答案: