单项选择题
A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters
单项选择题 A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.
单项选择题 A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
单项选择题 A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.