单项选择题

A vessel constrained by her draft may display（）.

A.three all-round red lights
B.two 225°red lights
C.three all-round blue lights
D.two 225°blue lights

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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

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

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