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
Upon completion of fueling a gasoline driven vessel it is necessary to（）.
A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above -
单项选择题
There are（）rats on board.
A.not
B.no
C.any
D.none -
单项选择题
The vessel’s quarter is located（）.
A.abeam
B.dead astern
C.just forward of the beam on either side
D.on either side of the stern
