单项选择题
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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A.one black ball
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D.two cones，apexes together -
单项选择题
A vessel enagaged in fishing，and at anchor，shall show（）.
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