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

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Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）

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单项选择题

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D.in order to overcome the potential energy of water in the discharge line