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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題There are()rats on board.

A.not
B.no
C.any
D.none

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題The use of liners in riveted construction is eliminated by using().

A.lapped construction
B.strapped construction
C.joggled construction
D.belted construction

5.單項(xiàng)選擇題The upward slope of a vessels bottom from the keel to the bilge is called().

A.camber
B.sheer
C.rake
D.rise of bottom