单项选择题
A.red B.red and white C.green D.green and white
A towing vessel 30 meters in length is pushing barges a...
单项选择题A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
A.One B.Two C.Three D.Four
A towing light，according to the Rules，is a（）.A.white li...
单项选择题A towing light，according to the Rules，is a（）.
A.white light B.red light C.yellow light D.blue light
A towing light is a yellow light having the same charac...
单项选择题A towing light is a yellow light having the same characteristics as a(n)（）
A.special flashing light B.anchor light C.sternlight D.masthead light
