单项选择题
A.act as a shock absorber
B.maintain the stored oil under pressure
C.act as a base or foundation for the power unit
D.eliminate pressure surges in the system
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 When air is at its dew point it is at its（）
单项选择题 If you find an extremely large refrigerant leak while using a halide torch, your flame will（）