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
单项选择题 Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）
单项选择题 Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?（）
单项选择题 A centrifugal bilge pump requires priming （）.
