单项选择题
The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.
A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second
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When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.
A.flooding back
B.superheating
C.overflowing
D.recycling -
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What is a function of the wearing rings used in most centrifugal pumps?（）
A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the discharge side from the suction side
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单项选择题
If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of （）.
A.cooling only
B.cooling and humidifying
C.cooling and dehumidifying
D.adiabatic cooling
