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单选题
Fires involving combustible metals are classified as （）.
A
class A fires
B
class B fires
C
class C fires
D
class D fires
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solid materials such as wood or bales of fiberB
inflammable liquidsC
electrical equipmentD
metallic solids
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单选题What is an advantage of using foam in fire fighting?（）A
It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)B
Most foams can be used with dry chemicals to attack a fire by two methodsC
Foam is effective on combustible metal firesD
Foam can be made with seawater or fresh water
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Grade E combustible liquid
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charted record of atmospheric temperature over timeB
charted record of atmospheric pressure over timeC
graphic record of combustible gases measured in an atmosphereD
graphic record of vapor pressure from a flammable/combustible liquid
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two kinds of casesC
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单选题A fire involving trash and paper waste would be classified as a （）.A
class AB
class BC
class CD
class D
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class AB
class BC
class CD
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removing the oxygenB
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单选题A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.A
purifiesB
combinationsC
concentrationsD
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单选题Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.A
flash pointB
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removes combustible gases in the crankcaseB
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单选题A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.A
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单选题An inert gas system on a tanker should be used to（）.A
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blow out cargo lines to prevent the build up of gas concentrationsC
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prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent gas concentrationsC
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prevent fires in the pumproom by continually displacing flammable vapors
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