No fog signal
A prolonged blast at intervals never to exceed more than two minutes
A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes
A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
第1题：
A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when ______.
A.directly astern and pushing the tow
B.towing on a hawser
C.towing alongside and parallel to the vessel it is towing
D.towing on the hip
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 vessel engaged in ______ shall not impede the passage of any other vessel navigating within a narrow channel or fairway．
A.mine clearance operation
B.towing operation
C.dredging or surveying or underwater operation
D.fishing
第4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5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6题：
A vessel is considered to be "restricted in her ability to maneuver" under the Rules if she is ______.
A.at anchor
B.mineclearing
C.engaged in fishing
D.engaged in towing
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：
If you are the Master of a towing vessel whose only working radar no longer functions，what must you do?
A.Notify the Captain of the Port (COTP) if you cannot repair it within 96 hours
B.Notify the Officer in Charge of Marine Inspection (OCMI) if you cannot repair it within 48 hours
C.Moor the vessel until it is repaired
D.Anchor the vessel until it is repaired
第9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10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