need not show the lights for a vessel engaged in towing，if it is impractical to do so
may show the lights for a vessel not under command
must show a yellow light above the stern light
must show the lights for a vessel towing
第1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2题：
An ocean tow is sinking in deep water. Attempts to sever the towing hawser are unsuccessful Which action should now be taken?______.
A.Abandon the towing vessel.
B.Radio for emergency assistance.
C.Slip the towline and allow it to run off the drum.
D.Secure all watertight openings on the towing vessel.
第3题：
An International Tonnage Certificate will be issued to a vessel when it meets several requirements，one of which is that the vessel must ______.
A.admeasure over 100 GT
B.be 79 or more feet in length
C.engage in intercoastal or international trade
D.be issued a Certificate of Inspection
第4题：
By day，she shall carry a black cylinder shape
By day，she shall carry two black balls in a vertical line
By night，she would show the same lights as a vessel not under command
By day，she would show the same shapes as a vessel restricted in her ability to maneuver
第5题：
a vessel towing by pushing ahead
a power-driven vessel，not towing
a barge being pushed ahead
either answer A or answer B
第6题：
A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of ______．
A.A vessel towing by pushing ahead
B.A power-driven vessel，not towing
C.A barge being pushed ahead
D.Either answer A or answer B
第7题：
If practical, when shall a manned vessel being towed sound her fog signal?______.
A.Immediately before the towing vessel sounds hers
B.Immediately after the towing vessel sounds hers.
C.As close to the mid-cycle of the towing vessel’s signals as possible
D.At any time as long as the interval is correct
第8题：
Persons who have taken part in salvage operations，notwithstanding the express and reasonable prohibition on the part of ______________，have no right to any remuneration.
A.the vessel from which the services were rendered
B.the vessel to which the services were rendered
C.the persons whose lives were saved
D.the salvors of the vessel，her cargo and accessories
第9题：
increase control of the tow
prevent the towing vessel from going in irons
make the towing vessel less maneuverable
reduce shock stress on the towing hawser
第10题：
Abandon the towing vessel
Radio for emergency assistance
Slip the towline and allow it to run off the drum
Secure all watertight openings on the towing vessel