單項選擇題

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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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.shown at the bow
B.white in color
C.shown in addition to the sternlight
D.an all-round light