单项选择题
What is the BEST conductor of electricity（）.
A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water
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相关考题
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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
