单项选择题
A.shown below the sternlight B.white in color C.displayed at the masthead D.a yellow light having the same characteristics as the stern light
A towing light is（）.A.shown at the bowB.white in colorC...
单项选择题A towing light is（）.
A.shown at the bow B.white in color C.shown in addition to the sternlight D.an all-round light
A towing light（）.A.flashes at regular intervals of 50-7...
单项选择题A towing light（）.
A.flashes at regular intervals of 50-70 flashes per minute B.is yellow in color C.shows an unbroken light over an arc of the horizon of not less than 180°nor more than 225° D.All of the above
A signal of one prolonged，one short，one prolonged，and o...
单项选择题A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.
A.engaged on pilotage duty B.in distress C.at anchor D.being overtaken in a narrow channel
