A.nitrogen
B.oxygen
C.carbon dioxide
D.water vapor
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A.5% or less
B.10% or less
C.15% or less
D.20% or less
A.97 times greater
B.94 times greater
C.10 times greater
D.2 times greater
A.over an electrically heated platinum filament
B.where it is mixed with nitrogen
C.where it is ignited by a sparking device
D.where its specific gravity is measured
A.combustible liquid
B.flammable gas
C.flammable liquid
D.flammable solid
A.the gasoline tank is full
B.the bilges，cabins，etc. are thoroughly ventilated
C.you have fresh water on board
D.Each of the above is followed
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Gasoline vapor tends to collect（）.
The shut off valve at the gasoline tank which can be operated from outside the tank space （）.
Upon release to the atmosphere，LFG readily（）.
It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.
Where should the tops of vents from gasoline tanks terminate?（）.
Gasoline tanks should be filled（）.
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
The vapor pressure of a substance（）.
When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
The tops of vents from gasoline tanks should terminate（）.