单项选择题 Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

单项选择题 The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

单项选择题 A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）