A.5% or less
B.10% or less
C.15% or less
D.20% or less
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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
A.with
B.by
C.of
D.for
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Butadiene，inhibited，is labeled as a（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
The weight of liquefied petroleum gas vapors as compared to air is（）.
Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
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（）.
What is used to test a tank for oxygen content?（）
The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
Storage batteries should be charged in a well ventilated area because（）.
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.