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單項(xiàng)選擇題

What is the BEST conductor of electricity（）.

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

單項(xiàng)選擇題

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