A:15°
B:20°
C:25°
D:30°
句型转换
设圆O1和圆O2是两个定圆,动圆P与这两个定圆都相切,则圆P的圆心轨迹可能是( ) ① ② ③ ④ ⑤
Many ____ (visit) come to Kunming every year.