单选题A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.ApumpBengineCturbineDboiler
单选题
A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.
A
pump
B
engine
C
turbine
D
boiler
参考解析
解析：
暂无解析
相关考题：
分析以下程序的输出结果是（ ）。 main {int a=5,b=-1,c; c=adds(a,b); printf(“%d”,c); c=adds(a,b); printf(“%d\n”,c); } int adds(intx,int y) {static int m=0,n=3; n*=++m; m=n%x+y++; return(m); }A.2,3B.2,2C.3,2D.2,4
Which two statements are true about TCP communication?() A. The receiver acknowledges the final packet in each communications stream.B. The receiver adds sequencing numbers to the packets received.C. The sender adds sequencing numbers to the packets it sends.D. The receiver acknowledges each packet it receives from the sending device.
Which command will retrieve ／unix and dump fromthe dump device?() A.snap -RB.snap -DC.snap -UD.snap -N
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
What is a characteristic of assigning a static VLAN membership？（）A、VMPS server lookup is requiredB、Easy to configureC、Easy of adds，moves，and changesD、Based on MAC address of the connected device
A technician plugs a USB device into the front panel of a desktop computer and nothing happens.The technician knows that plug-n-play is enabled. Which of the following BEST describes a possible cause to this issue?（）A、The technician plugged a USB 2.0 device into a USB 1.1 port.B、The technician needs to reboot the computer for the device to work.C、The technician plugged a USB 1.1 device into a USB 2.0 port.D、The front panel connectors are not plugged into the motherboard.
Which two statements are true about TCP communication?（）A、The receiver acknowledges the final packet in each communications stream.B、The receiver adds sequencing numbers to the packets received.C、The sender adds sequencing numbers to the packets it sends.D、The receiver acknowledges each packet it receives from the sending device.
Which of the following is included in IBM Systems Director Express Edition?（）A、Energy managementB、Virtual image deploymentC、Virtual resource managementD、Networking device management
When using Device Manager, a red ‘X” indicates which of the following?（）A、Device is disabledB、Device conflictC、No device driver foundD、Device has not been digitally signed
Which command will retrieve /unix and dump from the dump device？（）A、snap -RB、snap -DC、snap -UD、snap -N
单选题The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）Are-evaporatorBreceiverCdehydratorDsolenoid
单选题While flowing through the volute in a centrifugal pump, part of the （） energy of the liquid is converted to （） energy.Akinetic；pressureBkinetic；essentialCpressure；kineticDpressure；height
单选题Which of the following statements about pump operations is NOT a correct statement?（）AIn order for a fluid to be pumped, a fluid must be made to flowBA substance must be cold in order for it to be pumpedCThe kinetic energy imparted by the pump can be used to force a liquid through a hydraulic systemDA pump must receive its energy from an external source
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A pump is defined as device that（）Aproduces pressureBimparts energy to a fluid to move it from level ‘A’ to level ‘B’Ccreates a vacuum to move a liquid in all installationDis to develop a pressure differential
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The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.Aelectric motorBvoluteCimpellerDdiffusion nozzle
单选题Which of the following terms could be applied to the simple definition the energy of motion?（）AElectrical energyBThermal energyCPotential energyDKinetic energy
单选题The basic function of the centrifugal pump impeller is to （）.Adirectly increase the pressure of the liquid being pumpedBdirectly increase the velocity of the liquid being pumpedCconvert the potential energy of the liquid to kinetic energyDseparate air from the liquid being pumped
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Which of the following forms of energy is demonstrated through the process of combustion?（）AChemical energyBMechanical energyCThermal energyDElectrical energy
多选题Which two statements are true about TCP communication?（）AThe receiver acknowledges the final packet in each communications stream.BThe receiver adds sequencing numbers to the packets received.CThe sender adds sequencing numbers to the packets it sends.DThe receiver acknowledges each packet it receives from the sending device.
单选题Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）AImpellerBElectric motorCVoluteDEye