A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.

A vessel is “in sight” of another vessel when（）.

A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.

A vessel traveling down a narrow channel，especially if the draft is nearly equal to the depth of the water，may set off the nearer side. This effect is known as（）.

A vessel sighting a northern right whale dead ahead should（）.

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.

A vessel servicing a pipeline during the day shall display（）.

A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE? （）

A vessel trawling will display a（）.

A vessel is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.