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单选题
One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.
A
the snow which is sometimes discharged along with the gas is toxic
B
prolonged exposure to high concentrations of C02 gas causes suffocation
C
rapid dissipation of the C02 vapor
D
the C02 gas is lighter than air and a large amount is required to extinguisha fire near the deck
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更多 “单选题One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.A the snow which is sometimes discharged along with the gas is toxicB prolonged exposure to high concentrations of C02 gas causes suffocationC rapid dissipation of theC02 vaporD the C02 gas is lighter than air and a large amount is required to extinguisha fire near the deck” 相关考题
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If the () of carbon dioxide in the atmosphere is increased as a result of air pollution.
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The ___________ of gases such as carbon dioxide should be stabilized at their present level.
A、emissionB、emitC、radiationD、evaporation
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One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space isA.the 'snow' which is sometimes discharged along with the gas is toxicB.prolonged exposure to high concentrations of CO2 gas causes suffocationC.rapid dissipation of the CO2 vaporD.the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck
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Theoretical perfect combustion in a diesel engine yields by-products of_____.A.aldehydes and carbon dioxideB.water vapor and carbon monoxideC.nitrogen and carbon monoxideD.water vapor and carbon dioxide
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A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by ______.A.one controlB.two controlsC.three controlsD.none of the above
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In the event of fire in a machinery space，______.A.the fixed carbon dioxide system should be used only when all other means of extinguishment have failedB.the fixed carbon dioxide system should be used immediately，as it is the most efficient means of extinguishmentC.water in any form should not be used as it will spread the fireD.the space should be opened 5 minutes after flooding CO2 to prevent injury to personnel
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What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above
考题
The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．A.Forming a cloud cover over the flamesB.Directing the gas at the base of the flames in a slow sweeping motionC.Discharging the carbon dioxide into the heart of the flamesD.Bouncing the discharge off an adjacent bulkhead just above the burning surface
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______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
考题
单选题As compared to carbon dioxide，dry chemical has which advantage?（）.A
CleanerB
Effective on metal firesC
Greater rangeD
More cooling effect
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填空题Glucose can be completely broken down into carbon dioxide and water when oxygen is present in the process called aerobic respiration.____
考题
单选题The discharge from a carbon dioxide fire extinguisher should be directed（）.A
at the base of the flamesB
at the center of the flamesC
to the lee side of the flamesD
over the tops of the flames
考题
单选题An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.A
lack of toxicityB
the multipurpose extinguishing abilityC
burn-back protectionD
cooling ability
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单选题The danger associated with using carbon dioxide in an enclosed space is（）.A
frostbiteB
skin burnsC
asphyxiationD
an explosive reaction
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单选题An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.A
greater rangeB
effective on all types of firesC
cleanlinessD
All of the above
考题
单选题As compared to carbon dioxide,dry chemical has which advantage?（）.A
CleanerB
EffectiveC
Greater rangeD
More cooling effect
考题
单选题According to the Chemical Data Guide，when burning，the grade B flammable liquid，carbon disulfide produces（）.A
phosgene gasB
sulfuric acid gasC
sulfur dioxide gasD
carbon tetrachloride
考题
单选题When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher，the stream should be directed at the（）.A
base of the flames，moving the horn from side to side，following the flames upward as they diminishB
top of the flaming area，moving the horn from side to side，following the flames downward as they diminishC
center of the flaming area，moving the horn vertically from top to bottomD
bottom of the flaming area，moving the horn vertically to the top following the flames upward as they diminish
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单选题Theoretical perfect combustion in a diesel engine yields by-products of （）.A
aldehydes and carbon dioxideB
water vapor and carbon monoxideC
nitrogen and carbon monoxideD
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单选题What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）A
Effective even if ventilation is not shut downB
Will not deteriorate in storageC
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Effective on electrical equipment
考题
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
Carbon dioxide is corrosive when exposed to fireB
Carbon dioxide should be applied slowly to a large engine room fireC
Its total cooling effect is far greater than waterD
Its smothering effect is excellent for class B fires
考题
判断题Natural systems can reduce the amount of carbon dioxide in the atmosphere caused by carbon emissions.A
对B
错
考题
单选题One of the disadvantages of personal sailing lies in its ______A
competitionB
flexibilityC
complexityD
heavy cost
考题
单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）A
Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationB
Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasC
Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasD
This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas
考题
单选题When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）.A
first to the bottom of the flaming area，sweeping from side to side，and following the flames upwardB
in a circular motion from the middle of the bulkhead outwardC
to the top of the flaming area，sweeping from side to side，and working toward the bottomD
in an up-and-down motion from one side of the bulkhead to the other
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