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
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A.positive
B.negative
C.zero
D.vertical
A.If the quadrantal spheres are out as far as possible replace them with smaller spheres
B.If the quadrantal spheres are in as far as possible remove one of the spheres
C.If the quadrantal spheres are in as far as possible replace them with smaller spheres
D.If the quadrantal spheres are out as far as possible，move the quadrantal spheres in
A.If the quadrantal spheres are all the way out，replace them with smaller spheres
B.If the quadrantal spheres are all the way in，replace them with larger spheres
C.If the quadrantal spheres are all of the way out，move the spheres in
D.If the quadrantal spheres are all the way out，replace them with larger spheres.
A.Move the quadrantal spheres closer to the compass
B.Raise the heeling magnet if the red end is up
C.Remove some of the Flinders bar
D.Raise or lower the athwartship magnets
A.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets.
B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
D.If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
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A vessel entering the eye of a hurricane should expect（）.
A vessel is to make a voyage between New York and San Juan，Puerto Rico，and return. The crew should be signed on（）.
A vessel trawling will display a（）.
A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.
A vessel sailing shall keep out of the way of all of the following vessels except a vessel （）.
A vessel displaying three red lights in a vertical line is（）.
（）is due，in spite of that the salvage services have been rendered by or to vessel belonged to the same owner.
A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.
A vessel is “engaged in fishing” when（）.
A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.