单项选择题
One function provided by a hydraulic accumulator is to（）
A.provide an area where air can separate from the oil
B.provide an area to separate solid contaminants from the oil
C.act as an oil and water separator
D.absorb shocks occurring in the system
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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 （）
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单项选择题
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A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
