单选题A definite advantage of using water as a fire extiguishing agent is its characteristic of（）.Aalternate expansion and contraction as water in a liquid state becomes a vaporBabsorption of smoke and gases as water is converted from a liquid to a vaporCrapid contraction as water is converted from a liquid to a vaporDrapid expansion as water absorbs heat and changes to steam
单选题
A definite advantage of using water as a fire extiguishing agent is its characteristic of（）.
A
alternate expansion and contraction as water in a liquid state becomes a vapor
B
absorption of smoke and gases as water is converted from a liquid to a vapor
C
rapid contraction as water is converted from a liquid to a vapor
D
rapid expansion as water absorbs heat and changes to steam
参考解析
解析：
暂无解析
相关考题：
One advantage of the all-purpose nozzle is that it ______.A.can fit any size hoseB.converts a stream of water into a fogC.increases the amount of water reaching the fireD.can spray two streams of water at the same time
A()isaboilerwherethewater／steamsidegetsheatinputbothfromthemainenginesexhaustgasandfromanoilfiredburnersupplementingtheheatinputtoproducetherequiredsteam。 A、fire-tubeboilerB、auxiliaryboilerC、water-tubeboilerD、compositeboiler
In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite
A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the ______．A.Fire hose might be damaged by cargo operationsB.Vessel is in portC.Fire-main system is not chargedD.Fire pumps are used for purposes other than supplying water to the fire main
A galley grease fire on the stove may be extinguished using______．A.waterB.foamC.the range hood extinguishing systemD.fire dampers
An important step in fighting any electrical fire is to ______.A.stop ventilationB.stop the vesselC.de-energize the circuitD.apply water to extinguish the fire
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On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.Aacrylic acidBbenzeneColeumDvinyl toluene
单选题One advantage of the all-purpose nozzle is that it（）.Acan fit any size hoseBconverts a stream of water into a fogCincreases the amount of water reaching the fireDcan spray two streams of water at the same time
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.Ashield fire fighters from radiant heatBbreak up burning materialCget the most water possible on the fireDdrive heat and smoke ahead of the fire fighters
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）Anatural circulation of the water in the water tube boiler is better than that in the fire tube boilerBfor the same output the water tube boiler will carry less mass of water compared with the fire tube boilerCthe water tube boiler will cost shorter time for steam raisingDthe water tube boiler require lower skill in operating and maintaining
单选题Which firefighting method is an example of an indirect attack on a fire?（）.ABouncing a straight stream of water off the overhead to create spray effectBSpraying foam on a bulkhead and letting it flow down and over a pool of burning oilCFlooding a paint locker with CO2 and sealing the compartmentDCooling adjacent bulkheads with water to prevent the spread of the fire by conduction
单选题What is an advantage of using foam in fire fighting?（）AIt is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)BMost foams can be used with dry chemicals to attack a fire by two methodsCFoam is effective on combustible metal firesDFoam can be made with seawater or fresh water
单选题An important step in fighting any electrical fire is to（）.Astop ventilationBstop the vesselCde-energize the circuitDapply water to extinguish the fire
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A distorted furnace in a fire-tube auxiliary boiler may be the result of （）Afiring for extended periods in the low fire modeBoverheating, due to waterside depositsCvarying the water level above the crown sheetDcarrying excessive alkalinity in the boiler water
单选题When should a fire be ventilated?（）AWhen attacking the fire directlyBWhen using a steam smothering systemCWhen using the fixed CO2 systemDAll of the above
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An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.Agreater rangeBeffective on all types of firesCcleanlinessDAll of the above
单选题（）belongs to emergency power supplying equipments.AEmergency fire pumpBWindlassCMain sea water pumpDFresh water pump
单选题A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.Aalternate expansion and contraction as water in a liquid state becomes a vaporBabsorption of smoke and gases as water is converted from a liquid to a vaporCrapid contraction as water is converted from a liquid to a vaporDrapid expansion as water absorbs heat and changes to steam
单选题When sailing in cold zones, the（） should be drained of water.Athe ventilation pipeBthe water line for fire fighting on the deckCthe fuel oil lineDthe water supplying line in bath room
单选题What are the most important reasons for using water fog to fight fires?（）ASmothers burning surfaces，organically destroys fuelBCools fire and adjacent surfaces，provides protective barrierCReaches areas not protected by steam or CO2 smothering systemsDAllows fire to be attacked from leeward，saturates liquid surfaces
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