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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The vapor pressure of a substance（）.
Name one major advantage of transporting gas under refrigeration.（）
Storage batteries should be charged in a well ventilated area because（）.
One of the principal dangers inherent in liquefied petroleum gas is（）.
The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
Where should the tops of vents from gasoline tanks terminate?（）.
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.
What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.