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A fuel-air mixture below the lower explosive limit is too ______．
A.Rich to burn
B.Lean to burn
C.Cool to burn
D.Dense to burn
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单选题A fuel-air mixture below the lower explosive limit is too（）.A
rich to burnB
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单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）A
De-energizes the charged mist effectB
Maintains a positive pressure on the vent header to cool the flammable vaporsC
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Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
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单选题The atmosphere in a tank is too lean if it is（）.A
incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)B
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单选题Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）A
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The mixture is too rich to burnC
The vapor is about to explodeD
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单选题When flammable liquids are handled in a compartment on a vessel，the ventilation for that area should be（）.A
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单选题The explosive range of a mixture of flammable vapors is specified as a percentage of （）.A
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单选题An inert gas system on a tanker should be used to（）.A
prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent the build up of gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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单选题An inert gas system on a tanker should be used to（）.A
prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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单选题The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.A
auto-ignition pointB
flash pointC
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单选题主甲板以下是二层甲板。（）A
The deck below the lower deck is known as ‘tween deck.B
The deck below the main deck is known as ‘tween deck.C
The deck above the main deck is known as ‘tween deck.D
The deck below the lower deck is known as main deck.
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