A.variable
B.the same
C.lighter
D.heavier
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A.decreases as temperature increases
B.increases with the temperature
C.is not affected by temperature
D.may increase or decrease as the temperature rises
A.soluble state
B.solid state
C.liquefied state
D.inert state
A.in open air
B.inside cabins
C.in machinery space
D.underwater
A.actuator
B.annulus
C.accumulator
D.annular preventer
A.controls the amount of gasoline to the engine
B.shuts off the gasoline supply at the tank
C.is used if the gasoline tank leaks
D.All of the above
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Storage batteries should be charged in a well ventilated area because（）.
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（）.
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 （）.
The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
Name one major advantage of transporting gas under refrigeration.（）
The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
What would you consult to determine the number of persons required on duty while loading a cargo of leaded gasoline on your tanker? （）