While you are on watch entering port，the Master gives the helmsman a rudder command which conflicts with a rudder command from the Pilot.You should make sure the helmsman（）.

单项选择题While underway in thick fog you are on watch and hear the cry“man overboard”.Which type of maneuver should you make（）.

A.Figure eight turn
B.Round turn
C.Racetrack turn
D.Williamson turn

单项选择题What is the BEST conductor of electricity（）.

A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water

单项选择题The officer in charge of the navigational watch shall not hand over the watch to the relieving officer if（）.

A.there is reason to believe that the latter is not capable of carrying out the watchkeeping duties effectively
B.the ship is fitted with automatic steering
C.there is daylight or darkness
D.at no time shall the bridge be left unattended

单项选择题The Master to prosecute all voyages with the utmost（）and to render customary assistance with the Vessel’s Crew.

A.Fastness
B.Speeding
C.Swiftness
D.Despatch

单项选择题Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew（）.

A.in lieu of life preservers during fire drills
B.in lieu of life preservers during boat drills
C.in lieu of life preservers during an actual emergency
D.when carrying out duties near a weather deck's edge