单项选择题 （） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.

单项选择题 One of the functions of ventilation is to （） the humidity of spaces containing sources of moisture, or to （） the temperature of spaces not mechanically cooled such as the engine room.

单项选择题 Air conditioning is the process of treating air to control （） its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.