only if she is towing astern
only if the tow exceeds 200 meters
at any time when towing
if the towing vessel is part of a composite unit
第1题：
A towing light is ______.
A.shown below the stern light
B.white in color
C.displayed at the masthead
D.a yellow light having the same characteristics as the stern light
第2题：
A vessel towing a barge astern would show，at the stern ______.
A.only a stern light
B.a towing light above the stern light
C.two towing lights in a vertical line
D.two white lights in a vertical line
第3题：
A single vessel being towed alongside shall exhibit ______.
A.one all-round white light
B.sidelights and a stern light
C.only the outboard sidelight and a stern light
D.a masthead light，sidelights，and a stern light
第4题：
The vessel must carry only the lights that comply with the rules; the others may be omitted
The vessel's lights must comply as closely as possible，as determined by her government
The vessel must be altered to permit full compliance with the rules
An all-round light should be substituted for the after masthead light and the stern light
第5题：
A METHOD OF TOWING VESSELS THROUGH POLAR ICE BY MEANS OF ICEBREAKING TUGS WITH A SPECIAL STERN NOTCH SUITED TO RECEIVE AND HOLD THE BOW OF THE VESSEL TO BE TOWED defines ______.
A.Towing operations
B.Rigid coupled towing
C.Close coupled towing
D.Hard coupled towing
第6题：
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
第7题：
A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit ______.
A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，stern light and towing light
D.All of the above
第8题：
A towing light is ______.
A.shown at the bow
B.white in color
C.shown in addition to the stern light
D.an all-round light
第9题：
An overtaking situation at night would be one in which one vessel sees which light(s) of a vessel ahead ?______.
A.Masthead lights and sidelights
B.One sidelight, the masthead lights and stern-light
C.Both sidelights
D.Stern-light
第10题：
shown below the stern light
white in color
displayed at the masthead
a yellow light having the same characteristics as the stern light