单选题Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）AThe mixture is too lean to burnBThe mixture is too rich to burnCThe vapor is about to explodeDConditions are perfect for combustion
单选题
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）
A
The mixture is too lean to burn
B
The mixture is too rich to burn
C
The vapor is about to explode
D
Conditions are perfect for combustion
参考解析
解析：
暂无解析
相关考题：
Concerning baby-sitting and managing a paper route, which of the following statement is true?A． Both call for daily service.B． Both call for a sense of responsibility.C． Neither is affected by bad weather.D． Neither is helpful to character development.
All the following statements concerning the nature of language change is true except() A language change is inevitableB language change is abruptC language change is universalD language change is extensive
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?A.The mixture is too lean to burnB.The mixture is too rich to burnC.The vapor is about to explodeD.Conditions are perfect for combustion
Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
According to the passage, which of the following is NOT true?__________ 查A.Social change tends to meet with more difficulty in basic and emotional aspects of societyB.Disagreement with and argument about conditions tend to slow down social changeC.Social change is more likely to occur in the material aspect of societyD.Social change is less likely to occur in what people learned when they were young
Which of the following is Not True?A. Advertisement makes contribution to our pockets and we may know everythingB. We can buy what we wantC. Products of good quality don't need to be advertisedD. Advertisement makes our life colorful19. Which of the following is Not True?
Which of the following statements is true according to Tocqueville？( ) A.As social conditions and opportunities improve，social satisfaction grows more quickly. B.Social mechanisms have seemingly conflicting nature. C.As social conditions improve，there will be fewer people enjoy the social privilege. D.As social conditions improve，the people will have more concentrated power.
Which of the following concerning natural gas is NOT true？( ) A.It was not favored in the past. B.It is easily affected by the change of the climate. C.People are beginning to realize its value. D.It is increasingly cheaper to be liquefied.
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。A、This command should be executed from the global configuration modeB、The IP address 10.121.16.8 is the local router port used to forward dataC、102 is the remote DLCI that will receive the informationD、This command is required for all Frame Relay configurationsE、The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC
Which statements concerning the relationships between the following classes are true？（） class Foo { int num； Baz comp = new Baz（）； } class Bar { boolean flag； } class Baz extends Foo { Bar thing = new Bar（）； double limit； } A、A Bar is a Baz.B、A Foo has a Bar.C、A Baz is a Foo.D、A Foo is a Baz.E、A Baz has a Bar.
单选题Which of the following statements concerning energy is correct?（）AEnergy can be created or destroyedBEnergy may not be transformedCThe total quantity of energy in the universe is always the sameDNone of the above
多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
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 of the following statements is true according to what you hear?APrices for houses in big cities have started to rise since this year.BPeople buy and sell houses to improve their living conditions.CEconomists believe that residence prices would drop.DEconomists warn people that price rise might slow down.
单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）AHigh pressure compressors are more efficient than low pressure compressorsBMechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitCTwo stage compressors are generally more efficient than single stage compressorsDThe volumetric efficiency is decreased in multistage compressors
单选题Which statement is TRUE concerning the gooseneck（）.AIt is a sailing maneuver which brings the vessel's head through the windBIt connects the boom to the mast and allows the boom to swing freelyCIt is a sailing condition where there is a loss of air flow over the sailsDNone of the above
单选题Which of the following statements is true concerning centrifugal pumps?（）AThey are particularly suited for pumping high viscosity fluidsBThey are started with the discharge valve openedCThe flow of liquid is developed by imparting energy due to the rotation of an impellerDThey are always mounted in a horizontal position
单选题Which of the following statements is true concerning any evaporator?（）AHigh conductivity of the distillate indicates distillate salinity is excessiveBIncreasing the absolute pressure of the shell will increase the distillers capacityCMesh separators are used in evaporators to filter the distillateDReducing the brine density will reduce the heat lost overboard
单选题Which of the following statements concerning fire-tube boilers is correct?（）ACombustion gases flow through the tubesBFlames impinge on the tubesCCombustion occurs in the tubesDWater flows through the tubes
单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）AThe cetane number affects the amount of injection lagBThe cetane number is an indication of the fuels viscosityCIgnition lag is reduced with fuels having a high cetane numberDThe cetane number is of little significance in the combustion process
单选题Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）ASub-cooled liquidBSub-cooled vaporCSuperheated vaporDLiquid
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）AIt is lower than the ignition temperatureBIt is the temperature at which a substance will spontaneously igniteCIt is the temperature at which a substance, when ignited, will continue to bumDIt is the temperature at which the released vapors will fall within the explosive range
单选题Which of the following statements is true concerning an oil cooler?（）AThe oil temperature is less than the cooling water temperatureBThe oil pressure is less than the cooling water pressureCThe oil pressure is greater than the cooling water pressureDThe oil flow control valve is always installed in the oil input line
单选题Which of the following is true concerning Frame Relay multipoint subinterfaces?（）AAn IP address is required on the physical interface of the central router.BAll routers are required to be fully meshed.CAll routers must be in the same subnet to forward routing updates and broadcasts.DMultipoint is the default configuration for Frame Relay subinterfaces.
单选题Which of the following is NOT true about the Hawthorne study?AIt was the first documented evidence of the psychological effects on doing work.BThe Hawthorne study continued for five years.CThey found that the workers responded not to the level of lighting but to the fact that other work conditions were not favorable.DThe study changed the focus from economics to a multifaceted approach.
单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）AThe agent is considered nontoxic at room temperature in low concentrationsBThe agent is less effective than carbon dioxideCHalon primarily extinguishes the fire by coolingDThe agent cannot be used on electrical fires because it leaves a residue
单选题According to the passage, which of the following statements is true?ATransporting goods and people is the most important technology in the history of mankind.BTechnology in transporting goods and people has changed human conditions more than anything else.CTechnology in spreading information has changed human conditions more than transportation technology.DTechnology in spreading information can’t change the economic development of society.