A.they generate heat
B.they emit hydrogen
C.of the toxic fumes they emit
D.they recharge faster in a well ventilated space
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A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing
A.It increases its volume
B.It reduces its volume
C.It has less product per volume
D.None of the above
A.exclusion of all sand and solid matter
B.cleaning with clean fresh or sea water
C.examination for fractures and pitting
D.All of the above
A.that
B.which
C.who
D.these
A.Make periodic inspections of bilges
B.Keep the barge under constant surveillance
C.Have a properly certificated tankerman or at least one licensed officer on board the towing vessel
D.Verify ullage readings
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The vapor pressure of a substance（）.
Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
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Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
Combustible gas indicators operate by drawing an air sample into the instrument（）.
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