结合材料说明公司要取得成功必须具备哪些因素?
如图,点A、B、C、D、O都在方格纸的格点上,若△COD是由△AOB绕点O按逆时针方向旋转而得,则旋转的角度为( )
I don't encourage people to take photographs like this without ____(允许), but by law we can publish.