單項選擇題A vessel sailing shall keep out of the way of all of the following vessels except a vessel （）.

A.not under command
B.engaged on pilotage duty
C.restricted in her ability to maneuver
D.engaged in fishing


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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