A.odor
B.color
C.pressure
D.density
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A.mimimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit
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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.
The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
The shut off valve at the gasoline tank which can be operated from outside the tank space （）.
Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
The vapor pressure of a substance（）.
When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
One of the principal dangers inherent in liquefied petroleum gas is（）.
Gasoline fumes tend to（）.
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
What would you consult to determine the number of persons required on duty while loading a cargo of leaded gasoline on your tanker? （）