名词解释题proton pump inhibitors
名词解释题
proton pump inhibitors
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相关考题：
Which statement is NOT true?A.In a simple vane pump, the rotor and cam ring are exactly concentricB.Balanced vane pump has an elliptical cam ringC.Liquid in both gear pump and vane pump are forced out to the outlet.D.Balanced vane pumps can work at a higher pressure than the simple vane pump
If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessary
The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ______.A.varying the pump discharge pressureB.varying the pump return pressureC.rotation of the pump plungerD.rotation of the pump barrel
单选题Cargo pump relief valves are piped to the（）.Acargo pump pressure gaugesBcrossover lines interconnecting two pumpsCsuction side of pumpsDatmosphere through pump vents
单选题The static suction lift of a pump is the difference in elevation between the （）.Acenterline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpBcenterline of the pump and the suction liquid level when the source of liquid is above the pumpCcenterline of the pump and the level of the discharge liquidDliquid levels of the suction and discharge
单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.Aone size larger than the pump discharge nozzleBthe same size as the pump discharge nozzleCone size smaller than the pump discharge nozzleDinstalled with a short radius elbow at the pump
单选题Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）Afacilitate bi-directional operationBprovide the greatest pump efficiencyCprevent pump clogging from marine growthDprevent cavitation at the pump outlet
单选题The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.Athe pump cylinderBthe pump camCthe pump plungerDthe pump miler
单选题The purpose of the wearing rings used in a centrifugal pump is to （）.Aprevent an internal explosion in the pump when it is overheatedBenable a visual inspection of the pump while it is runningCinsure a proper alignment of the pump coupling to the driverDaccommodate for friction between the impeller and the easing
单选题The terminal indicates to you that they are going to use a booster pump to assist the discharging operation. You start the discharge，and in a few minutes the pressure drops sharply. This could be a result of the（）.Abooster pump coming on the line and discharging properlyBbooster pump failing to startCbooster pump being lined up in the wrong directionDship's pump speeding up
单选题A relief valve for a cargo pump is generally installed（）.Aafter the discharge valveBbetween the pump and discharge valveCafter the suction valveDbetween the pump and suction valve
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.Aone size smaller than the pump suction nozzleBthe same size as the pump suction nozzleCone size larger than the pump suction nozzleDinstalled with a short radius elbow at the pump
单选题An increase in rotor clearances in a rotary pump will （）.Aincrease discharge pressureBdecrease pump capacityCdecrease pump cavitationDdecrease reaction ring clearance
单选题The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）Afuel delivery pressureBpump plunger diameterCplunger control rack positionDtotal pump stroke
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.Aincreased pump speedBexcessive pump discharge pressureCtoo low of a tilting box angleDlow pump speed
单选题Each fire pump on a ship must have a pressure gauge located at（）.Athe pump dischargeBthe manifold connectionCeach fire station dischargeDthe pump station
单选题On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）Acentrifugal pump is cheaper than reciprocating pumpBthe size of centrifugal pump with same capacity is smaller than that of reciprocating pumpCcentrifugal pump makes maintenance easier than reciprocating pump doesDall of the above
单选题The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）Avarying the pump discharge pressureBvarying the pump return pressureCrotation of the pump plungerDrotation of the pump barrel