单项选择题
A.only the lights for a vessel towing
B.only the lights for a vessel restricted in her ability to maneuver
C.the lights for a towing vessel and the lights for a vessel restricted in her ability to maneuver
D.the lights for a towing vessel and the lights for a vessel not under command
单项选择题 A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
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 （）.