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單項選擇題

A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）

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

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單項選擇題

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 （）

A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously

單項選擇題

When air is at its dew point it is at its（）

A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity