Zhu zhiwen is a farmer in Heze, Shandong. He likes to sing ____ (song) very much.
甲、乙两校分别有一男一女共4名教师报名到农村中学支教.
如图,在边长为1的正方形网格中,图形B是由图形A旋转得到的,则旋转中心的坐标为( )