单项选择题
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
A single towing light will be carried above a vessel’s ...
单项选择题A single towing light will be carried above a vessel’s sternlight（）.
A.only if she is towing astern B.only if the tow exceeds 200 meters C.at any time when towing D.if the towing vessel is part of a composite unit
A safe water daymark has what shape? （）A.TriangularB.Di...
单项选择题A safe water daymark has what shape? （）
A.Triangular B.Diamond C.Circular D.Octagonal
