单项选择题
A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.
A.are not the same color as either side light
B.have a lesser range of visibility than the prescribed lights
C.do not impair the visibility or distinctive character of the prescribed lights
D.All of the above
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A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.
A.wearing a life jacket
B.wearing a safety harness secured to the stage
C.wearing both a life jacket and a safety harness secured to the stage
D.the vessel is not making way -
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A vessel is to make a voyage between New York and San Juan，Puerto Rico，and return. The crew should be signed on（）.
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A vessel is overtaking when she can see which light(s) of a vessel ahead?（）
A.Only the stern light of the vessel
B.One sidelight and a masthead light of the vessel
C.Only a sidelight of the vessel
D.The masthead lights of the vessel
