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pressure potential（）
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greater will the water pressure beB
the water pressure will be greaterC
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high pressure liquidB
low pressure vaporC
high pressure vaporD
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primarily to lubricate the shaft sealsB
due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC
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in order to overcome the potential energy of water in the discharge line
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high pressure systemB
low pressure systemC
high dew pointD
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capacity will decreaseC
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suction pressure will decrease
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high pressure liquid lineB
low pressure liquid lineC
high pressure vapor lineD
low pressure vapor line
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单选题The direction of the surface wind is（）.A
directly from high pressure toward low pressureB
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from low pressure toward high pressure deflected by the earth's rotation
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单选题In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）A
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its pressure and temperature are both raisedC
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its pressure is raised and its temperature is lowered
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单选题The basic function of the centrifugal pump impeller is to （）.A
directly increase the pressure of the liquid being pumpedB
directly increase the velocity of the liquid being pumpedC
convert the potential energy of the liquid to kinetic energyD
separate air from the liquid being pumped
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APL是auto pressure lock的简写B
APL是adjustabLe pressure limiting的简写C
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APL是air pressure lift的简写E
APL是auto pressure lift的简写
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单选题A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.A
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kinetic energy to mechanical energy to potential energy
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pressure difference over timeD
vertical pressure variation
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At zero load the intake manifold pressure is greater than the exhaust manifold pressureB
At full load the intake manifold pressure and exhaust manifold pressure are equalC
At full load the intake manifold pressure is less than the exhaust manifold pressureD
At full load the intake manifold pressure is greater than the exhaust manifold pressure
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head pressure onlyC
superheat onlyD
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As pressure decreases, volume increasesB
As volume increases, pressure increasesC
As volume decreases, pressure decreasesD
As pressure increases, volume increases
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单选题An indication of a diesel engine air intake being partially clogged, is （）.A
low firing pressure and low exhaust temperaturesB
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high firing pressure and low exhaust temperaturesD
high firing pressure and high exhaust temperatures
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low pressure at all timesB
full pressure at all timesC
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full pressure at intermittence
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单选题Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）A
ImpellerB
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Eye
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