題目 4.2:
What is the snap-back zone while mooring/ tug line operation? Why the zone mark was suggested to be deleted now? Please answer in Chinese? (10%)
(在繫泊/拖船纜繩作業時，後衝區(snap-back zone)是什麼？為什麼現在建議刪除後衝區標誌？請用中文回答。)