單項選擇題A vessel engaged in fishing must display a light in the direction of any gear that extends outward more than 150 meters. The color of this light is（）.
A.white
B.green
C.red
D.yellow
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1.單項選擇題A vessel engaged in fishing during the day would show（）.
A.one black ball
B.two cones with bases together
C.a cone，apex downward
D.two cones，apexes together
2.單項選擇題A vessel enagaged in fishing，and at anchor，shall show（）.
A.an anchor light
B.sidelights and a sternlight
C.three lights in a vertical line，the highest and lowest being red，and the middle being white
D.None of the above
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