单项选择题

A vessel or object being towed astern shall display a(n)（）.

A.forward masthead light
B.after masthead light
C.stern light
D.All of the above

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单项选择题

A vessel not under command shall display（）.

A.two red lights at night and two black balls during daylight
B.two red lights at night and three black balls during daylight
C.three red lights at night and two black balls during daylight
D.three red lights at night and three black balls during daylight

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

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