The flash point of a liquid refers to the temperature ______.A.at which a liquid will give off inflammable（易燃的） vaporsB.at which a liquid will burn steadilyC.at which a liquid will explodeD.that a liquid must reach before it will flow readily
The flash point of a liquid refers to the temperature ______.
A.at which a liquid will give off inflammable（易燃的） vapors
B.at which a liquid will burn steadily
C.at which a liquid will explode
D.that a liquid must reach before it will flow readily
相关考题：
Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means _____.A.a liquidB.a pressureC.a temperatureD.none of the above
The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the( ). A.flash pointB.fire pointC.upper explosive limitD.lower explosive hmlt
A petroleum liquid has a flash point of 85°F. This is a grade ______.A.B flammable liquidB.C flammable liquidC.D combustible liquidD.E combustible liquid
A petroleum liquid has a flashpoint of 85℃．This liquid is in IMDG Code classed as a ______．A.Flammable liquidB.Nonflammable liquidC.Inflammable liquidD.Disflammable liquid
Special stowage in deep tanks is obviously required for ______．A.Liquid commodities in containersB.Bottled liquid commoditiesC.Common liquid commodities in bulkD.Liquid commodities in cylinders
Reid vapor pressure is ______．A.exerted by liquid cargo on the sides of a tankB.exerted by liquid cargo on a cargo hose bodyC.the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
Which of the following would BEST provide cooling to a processor?（）A、Case fanB、HeatsinkC、Liquid cooling systemD、CPU fan
Which of the following represents a safety hazard？（）A、liquid on the floorB、a tiled floorC、a concrete floorD、carpet
问答题The difference between a liquid and a gas is obvious (1)____ the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(describe) the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be “dissolved” in a vapor without losing its identity, and another theory held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.The (7)____(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other (8)____, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.
单选题According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）AColorless liquid，mild aromatic odorBPale yellow liquid，strong odorCColorless liquid，faint odorDStraw-colored liquid，sweet-odor
单选题Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.AfilledBevacuatedCcompressedDcharged
单选题Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means （）.Aa liquidBa pressureCa temperatureDnone of the above
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions
单选题The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.Aat which/to whichBfrom which/at whichCto which/from whichDin which/on which
单选题A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.AB flammable liquidBC flammable liquidCD combustible liquidDE combustible liquid
单选题The flash point of a liquid refers to the temperature （）Aat which a liquid will give off inflammable vaporsBat which a liquid will burn steadilyCat which a liquid will explodeDthat a liquid must reach before it will flow readily
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What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）ARefrigeratorBRefrigerantCCooling mediumDBrine
单选题Reid vapor pressure is（）.Aexerted by liquid cargo on the sides of a tankBexerted by liquid cargo on a cargo hose bodyCthe lowest temperature and pressure that will cause a flammable liquid to give off vaporsDa measurement of the amount of flammable vapors given off by a liquid at a certain temperature
单选题Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?（）ADegree of saturationBSaturation temperatureCSuperheated temperatureDDegree of superheat
单选题Sulfuric acid is a（）.Aclear syrupy liquid with no odorBcolorless-to-brown liquid with a choking odor when hotCcolorless liquid with a pleasant fruity odorDwhitish liquid with a faint，pleasant odor
单选题（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.ASetting pointBDew pointCFlash pointDLean point
单选题Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）AHeight of the machineBTemperature of the liquid sealCGravity discDBowl diameter
单选题The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the（）.Aflash pointBfire pointCupper explosive limitDlower explosive limit
单选题The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.Aboiling pointBflash pointCviscosity pointDtoxic point
单选题A petroleum liquid has a flash point of 85°F. This is a grade （）.AB flammable liquidBC flammable liquidCD combustible liquidDE combustible liquid