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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What would you consult to determine the number of persons required on duty while loading a cargo of leaded gasoline on your tanker? （）
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 vapor pressure of a substance（）.
Each inert gas system must be designed to supply the cargo tanks with a gas，or mixture of gasses，that has an oxygen content by volume of（）.
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（）.
Where is thicker plating usually found in the construction of integral tanks on a ship? （）
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.
When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
When fueling has been completed（）.