单项选择题
A lower thermostatic temperature setting will provide a desired degree of comfort in a room where （）
A.low relative humidity is maintained
B.triple banded squirrel cage fans are used
C.air circulation is a maximum
D.high relative humidity is maintained
单项选择题 To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）
单项选择题 To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
单项选择题 Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?（）