It was ____ ____ him ____ ____ the book in the classroom.
下图是人体局部内环境示意图。有关叙述正确的是( )
如图,在方格纸上建立的平面直角坐标系中,将△AB0绕点O按顺时针方向旋转90°,得到△A′B′O′,则点A′的坐标为( )