Dry powder is used to put out ________A.electrical fireB.oil fireC.common firesD.all kinds of fires
Dry powder is used to put out ________
A.electrical fire
B.oil fire
C.common fires
D.all kinds of fires
相关考题：
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
Foam is a very effective smothering agent and ______.A.it provides cooling as a secondary effectB.works well on extinguishing electrical firesC.can be used to combat combustible metal firesD.All of the above
共用题干The Smog（烟雾）For over a month,lndonesia was in crisis.Forest fires raged out of control as the country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog.This pollution quickly spread and within days it was hanging over neighbouring countries including Malaysia,Singapore and Thailand.When the smoke combined with pollution from factories and cars,it soon became poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and pollution levels rose. People wheezed（喘息）and coughed as they left the house and their eyes watered immediately.The smog made it impossible to see across streets and whole cities disappeared as grey soot（烟灰）covered everything. In some areas, water was hosed（用胶管浇）from high-rise city buildings to try and break up the smog.Finally,heavy rains,which came in November,put out the fires and cleared the air. But the environmental costs and health problems will remain.Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车排放的废气）and factory pollution. Breathing problems could well increase and many non-sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland forests,elephants,deer,and tigers have been driven out of their homes by smog.But smog is not just an Asian problem.In fact,the word was first used in London in 1905 to describe the mixture of smoke and thick fog.Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents.About 4, 000 Londoners died within five days as a result of thick smog in 1952.Water was used to try to break up the smog.A:Right B:Wrong C:Not mentioned
Close all fire doors and use the （）（干粉灭火器）.A、dry powder extinguisherB、foam extinguisherC、CO2 extinguisherD、portable extinguisher
重吊杆用于吊大的重件。（）A、Heavy derrick is used for lifting large heavy cargo.B、Derrick is used for lifting large heavy cargo.C、Heavy derrick is used for lifting dry bulk cargo.D、Derrick is used for lifting dry bulk cargo.
关闭所有防火门并使用干粉灭火器。（）A、Close all fire doors and use the dry powder extinguisher.B、Close all fire doors and use the foam extinguisher.C、Close all fire doors and use the CO2 extinguisher.D、Close all fire rooms and use the dry powder extinguisher.
An electrical fire should be put out by dry powder. （）A、电火应该使用干粉扑灭。B、木火应该用干粉扑灭。C、油火应该用干粉扑灭。D、普通火应该用干粉扑灭。
When a repeating timer expires,（）.A、The When-Timer-Expired trigger resets the timer's iteration parameter. B、The When-Custom-Item-Event trigger fires and executes the desired actions. C、It is put in a queue of expired timers for processing on a first-in-first-out basis. D、The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.
单选题What kind of （）can be used for gas and chemical fires?AequipmentBapparatusCextinguishersDmachines
单选题Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.AcoolingBsmotheringCoxygen dilutionDbreaking the chain reaction
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Which of the following is true according to the passage?ANot all the fires in the forests must be put out.BPeople‘s carelessness leads to dangerous fires.CAustralia allows all the fires to burn naturally.DThere are more fires in Russia than in the USA.
单选题Halon fire extinguishers are NOT effective when used on which types of fires?（）AFires in electrical equipmentBFlammable oils and greasesCClass A fires in ordinary combustiblesDMaterials containing their own oxygen
单选题Class C fires are best extinguished by （）.Afoam extinguishersBwater spray equipmentCdry powder extinguishersDsoda-acid extinguishers
单选题When a repeating timer expires,（）.AThe When-Timer-Expired trigger resets the timer's iteration parameter. BThe When-Custom-Item-Event trigger fires and executes the desired actions. CIt is put in a queue of expired timers for processing on a first-in-first-out basis. DThe When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.
单选题What is the main idea of Paragraph 4?AFires are serious threats to human beings.BAustralian firefighters don‘t put out fires.CFires can play an important role I forests.DIt‘s difficult for firefighters to control the fires.
单选题Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.Aauthorized fire equipment servicing personnel onlyBreplacing the propellent cartridge and refilling with powderCpuncturing the cartridge seal after installationDrecharging the cartridge and refilling it with powder
单选题An electrical fire should be put out by dry powder. （）A电火应该使用干粉扑灭。B木火应该用干粉扑灭。C油火应该用干粉扑灭。D普通火应该用干粉扑灭。
单选题Why did Russia have so many fires in one month in 2010?ABecause lightening spread the fire.BBecause there was much fuel for fires.CBecause there were not enough firefighters.DBecause it was unusually hot, dry and windy.
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent the build up of gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors