A:海陆分布
B:太阳辐射
C:地形因素
D:地面反射率
如图,AB是⊙O的直径,点C,D在⊙O上,且AD平分∠CAB,过点D作AC的垂线,与AC的延长线相交于点E,与AB的延长线相交于点F.
— Whose model plane is it?
— It's Jack's. He made it by _______.