我国的内海包括( )
A:渤海和琼州海峡
B:渤海和台湾海峡
C:黄海和琼州海峡
D:黄海和台湾海峡
根据入射光线和折射光线,在图中的虚线框内画出适当的透镜。
— What would you like in the future?
— I want to been engineer I grow up.