A、<span style=";font-family:宋体;font-size:14px">上一指定点或位</span></p><p></p>
B、<span style=";font-family:宋体;font-size:14px">坐标原点</span></p><p></p>
C、<span style=";font-family:宋体;font-size:14px">屏幕左下角点</span></p><p></p>
D、<span style=";font-family:宋体;font-size:14px">任意一点</span></p><p></p>