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pressure potential（）
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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
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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
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low pressure vapor line
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单选题The direction of the surface wind is（）.A
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from low pressure toward high pressure deflected by the earth's rotation
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its pressure is raised and its temperature is lowered
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directly increase the pressure of the liquid being pumpedB
directly increase the velocity of the liquid being pumpedC
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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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kinetic energy to mechanical energy to potential energy
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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
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At full load the intake manifold pressure is greater than the exhaust manifold pressure
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head pressure onlyC
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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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high firing pressure and low exhaust temperaturesD
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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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