单项选择题

A vessel not under command making way at night would show（）.

A.two all-round red lights in a vertical line
B.anchor lights and sidelights
C.two all-round white lights in a vertical line，sidelights and a stern light
D.two all-round red lights in a vertical line，sidelights，and a stern light

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单项选择题

A vessel may use any sound or light signals to attract the attention of another vessel as long as（）.

A.white lights are not used
B.red and green lights are not used
C.the signal cannot be mistaken for a signal authorized by the Rules
D.the vessel signals such intentions over the radiotelephone

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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