单项选择题
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
A red triangular daymark marks（）.A.the centerline of a ...
单项选择题A red triangular daymark marks（）.
A.the centerline of a navigable channel B.the starboard side of a channel C.a prominent object of navigational interest that has no lateral significance D.area of a channel where passing another vessel is permitted
A power-driven vessel，when towing astern，shall show（）.A...
单项选择题A power-driven vessel，when towing astern，shall show（）.
A.two towing lights in a vertical line B.a towing light in a vertical line above the sternlight C.two towing lights in addition to the sternlight D.a small white light in lieu of the sternlight
