A vessel towing a barge astern would show，at the stern（）.

（）is due，in spite of that the salvage services have been rendered by or to vessel belonged to the same owner.

A vessel is overtaking when she can see which light(s) of a vessel ahead?（）

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

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

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 not under command shall display（）.

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 is “engaged in fishing” when（）.

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