单选题Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.A97 times greaterB94 times greaterC10 times greaterD2 times greater
单选题
Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A
97 times greater
B
94 times greater
C
10 times greater
D
2 times greater
参考解析
解析：
暂无解析
相关考题：
The higher the standard of living,the(). A、greater is the amount og goods consumedB、greater amount of goods consumedC、amount of goods is used greaterD、greater the amount of goods consumed
Accumulated Depreciation ( ) A. is used to show the amount of cost expiration of intangiblesB. is the same as Depreciation ExpenseC. is a contra asset accountD. is used to show the amount of cost expiration of nat
The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.A.onto the surface of the burning liquidB.ahead of the burning liquid and bounce it on the fireC.at the base of the burning liquid in a sweeping motionD.just above the surface of the burning liquid
If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by ______.A.a Coast Guard inspection officerB.the safety man aboard the unitC.the designated person in charge of the unitD.the manufacturer or his authorized representative
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
When compared to a high-expansion foam，a low-expansion foam will ______．A.Be dryerB.Be lighterC.Be less heat resistantD.Not cling to vertical surfaces
Firefighting foam is only effective when the foam _____.A.penetrates to the bottom of the fireB.is kept saturated with low-velocity water fogC.mixes with the burning fuel oilD.completely covers the top of the burning liquid
What does the FREQ column show when running the tprof option?（）A、 Total amount of Ticks used by all users B、 Total amount of Ticks used by all processes C、 Total amount of Ticks used by a specific user D、 Total amount of Ticks used by a specific type of process
What does the FREQ column show when running the tprof option? （）A、Total amount of Ticks used by all usersB、Total amount of Ticks used by all processesC、Total amount of Ticks used by a specific userD、Total amount of Ticks used by a specific type of process
单选题Regular foam can be used on all but which flammable liquid?（）AMotor gasolineBJet fuelCCrude petroleumDAlcohol
单选题Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）Aactivate the driersBchange colorCsecure the compressorDadd a predetermined amount of liquid drier
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 is more important in determining the amount of free surface that will be produced?（）.AThe breath of the tankBThe length of the tankCThe amount of liquid in the tankDThe position of the tank in relation to the center line of the vessel
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 （） pump discharges a nearly constant amount of liquid regardless of pressure.Amixed-flowBaxial-flowCcentrifugalDdisplacement
单选题Which of the following statements regarding low expansion foam and its application is INCORRECT?（）.AFoam should not be used on electrical firesBOne kilo of low expansion foam solution produces much more foamCFoam is only efficient when it covers the top of burning combustiblesDA stream of foam should be deflected off the deck in order to best agitate the fire
单选题Which statement about firefighting foam is TRUE?（）AFoam conducts electricityBTo be most effective，foam should be directed at the base of the fireCFoam is most effective on burning liquids which are flowingDFoam can ONLY be used to extinguish class A fires
单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）AWater foamBDry chemical powderCWater fogDAlcohol foam
单选题The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.Aincrease the refrigerating effect, by decreasing the amount of flash gasBallow the refrigerant to enter the throttling device in a saturated conditionCincrease the refrigerating effect by increasing the amount of flash gasDminimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
单选题Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.Ain seriesBin parallelCassembledDtogether
单选题What type of liquid is used in the liquid P/V breaker（）.AHydraulic oilBWater-antifreeze mixtureCDistilled waterDOil from the cargo
单选题The effect of free surface on initial stability depends upon（）.Athe amount of liquid in the compartmentBthe dimensions of the liquid surface and the vessel's displacementConly the length of the compartmentDthe vertical position of the liquid in the vessel
单选题What does the FREQ column show when running the tprof option?（）A Total amount of Ticks used by all users B Total amount of Ticks used by all processes C Total amount of Ticks used by a specific user D Total amount of Ticks used by a specific type of process
单选题Firefighting foam is only effective when the foam（）.Apenetrates to the bottom of the fireBis kept saturated with low-velocity water fogCmixes with the burning fuel oilDcompletely covers the top of the burning liquid
单选题The foam extinguisher should be used （）.Ain the endBupside downCdown sideDon top