单项选择题

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
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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 （）.

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