What do the numbers in the image below indicate?EM7答案窝(daanwo.com)-大学生作业答案及考资分享平台

对于下图来说，每个标号所指示的区域分别是？EM7答案窝(daanwo.com)-大学生作业答案及考资分享平台

Afrozen area, unfrozen area, unscanned half-planeEM7答案窝(daanwo.com)-大学生作业答案及考资分享平台

Bunfrozen area, frozen area, unscanned half-planeEM7答案窝(daanwo.com)-大学生作业答案及考资分享平台

Cfrozen area, unfrozen area, scanned half-planeEM7答案窝(daanwo.com)-大学生作业答案及考资分享平台

Dunfrozen area, frozen area, scanned half-planeEM7答案窝(daanwo.com)-大学生作业答案及考资分享平台