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

A vessel is entering port “A” for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do? （）

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 not under command shall display（）.

A vessel is equipped with twin propellers，both turning outboard with the engines half ahead. If there is no wind or current and the rudders are amidships，what will happen?（）

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

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

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

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