The fire extinguishing action of CO 2 comes mostly from ______.A.breaking the fire chemical chain reactionB.smotheringC.coolingD.isolating the heat from the fuel
The fire extinguishing action of CO 2 comes mostly from ______.
A.breaking the fire chemical chain reaction
B.smothering
C.cooling
D.isolating the heat from the fuel
相关考题：
Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．A.fire-extinguishing mediumB.a standard fire testC.a non-combustible materialD.a fire main
A galley grease fire on the stove may be extinguished using______．A.waterB.foamC.the range hood extinguishing systemD.fire dampers
After extinguishing a fire with CO2, it is advisable to ______.A.use all CO2 available to cool the surrounding areaB.stand by with water or other agentsC.thoroughly ventilate the space of CO2D.jettison all burning materials
Generally, the first action in extinguishing an LFG fire caused by escaping gas is to ______.A.sweep flames away with water sprayB.shut off the leakC.use a chemical foam fire extinguisherD.call the local fire department
单选题If you are fighting a fire below the main deck of your vessel，which action is most important concerning the stability of the vessel?（）.AShutting off electricity to damaged cablesBPumping fire-fighting water overboardCManeuvering the vessel so the fire is on the lee sideDRemoving burned debris from the cargo hold
单选题When fighting a spreading fire resulting from a broken fuel line, you should FIRST （）.Alook for a CO2 extinguisherBuse a soda acid extinguisherCshut off the fuel supplyDsmother the fire with rags
单选题A class B fire is most successfully fought by（）.Apreventing oxygen from reaching the burning materialBcooling the burning material below its ignition temperatureCusing the extinguishing agent to make the burning material fire-resistantDusing the extinguishing agent to absorb the heat
单选题If you are fighting a fire below the main deck of your vessel，which action is most importantconcerning the stability of the vessel? （）AShutting off electricity to damaged cablesBPumping fire-fighting water overboardCManeuvering the vessel so the fire is on the lee sideDRemoving burned debris from the cargo hold
单选题The basic training in fire prevention and fire fighting should include the theoretical elements which should cover （）.Athe three elements of fire and explosionBlower and upper flammable limitsCclassification of flies and applicable extinguishing agentsDAll of the above
单选题The remote control for a fixed fire extinguishing system should be（）.Apainted red and labeledBconcealed from the crewCprotected by plexiglassDpadlocked
单选题What is an advantage of using foam in fire fighting?（）AIt is effective in controlling fire in flowing oil such as coming from a broken fuel lineBIt absorbs heat from materials that could cause reignitionCMost foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishmentDOnce the surface is blanketed with foam and the fire is extinguished，no further foam is required
单选题The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.Asecure all openings to the tankBdischarge an initial charge of CO2 with a hand portable extinguisherCdirect a fire hose into the tank and energize the fire mainDspray the tank boundaries with a fire hose to promote cooling
单选题Generally, the first action in extinguishing an LFG fire caused by escaping gas is to（）.Asweep flames away with water sprayBshut off the leakCuse a chemical foam fire extinguisherDcall t e local fire department
单选题Water is a very effective fire extinguishing agent because it（）Awill remove all the toxic fumes from the airBhas the greatest cooling abilityCwill leave no harmful residueDcompletely removes combustible vapors from the air
单选题In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.Aactuate an alarm and open the engine room control valveBactuate an alarm and open the engine room CO2 releasing valveCopen the engine room control valve and shut off engine room ventilation fansDopen the engine room control valve and then the CO2 releasing valve
单选题The best method of extinguishing a class A fire is to（）.Aremove oxygen from the areaBcool fuel below ignition temperatureCsmother with CO2Dsmother fire with foam
单选题During a fire drill on a ship，what action is required?（）AStart each fire pumpBLaunch and run a lifeboatCInventory rescue and fire equipmentDInspect fire hoses
单选题Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）ACO2BFoamCWater fogDSoda acid
单选题The fire extinguishing action of CO2 comes mostly from （）.Abreaking the fire chemical chain reactionBsmotheringCcoolingDisolating the heat from the fuel
单选题The best method of extinguishing a class A fire is to （）.Aremove oxygen from the areaBsmother fire with foamCsmother fire with CO2Dcool fuel below ignition temperature
单选题If a small fire initially breaks out in the engine room bilges, in which of the following sequences should the fire extinguishing agents or systems be used?（）AFixed CO2,semi-portable CO2, then hand portable CO2BSemi-portable CO2, fixedCO2, then hand portable CO2CHand portable, semi-portable CO2, then as a last resort the fixed CO2 systemDHand portable, fixed CO2, then as a last resort the semi-portable CO2
单选题After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.Aopened and burned material removedBleft closed with vents off until all boundaries are coolCchecked for oxygen contentDdoused with water to prevent reflash
单选题CO2 extinguishes a fire by （）.Aa blanket of bubbles formed on the surface of the fireBsmotheringCcoolingDisolating the heat from the fuel
单选题Your vessel is equipped with a fixed CO2 system and a fire main system. In the event of an electrical fire in the engine room what is the correct procedure for fighting the fire?（）AUse the CO2 system and evacuate the engine roomBUse the fire main system and evacuate the engine roomCEvacuate the engine room and use the CO2 systemDEvacuate the engine room and use the fire main system
单选题Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.Asweep flames away with water sprayBshut off the leakCuse a chemical foam fire extinguisherDcall the local fire department
单选题After extinguishing a fire with CO2，it is advisable to（）.Ause all CO2 available to cool the surrounding areaBstand by with water or other agentsCthoroughly ventilate the space of CO2Djettison all burning materials
单选题After extinguishing a fire with C02,it is availabe to（）.Ause all CO2 available to cool the surronding areaBstand by with water or other agentsCthoroughly ventilate the space of CO2Djettison all buring materials