单项选择题
Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）
A.changing the air filter
B.recharging the system
C.changing compressor lubricant
D.renewing container vacuum
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相关考题
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单项选择题
In an air conditioning system, moisture is removed from the air by（）
A.filers
B.separators
C.ducted traps
D.dehumidifiers -
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 （）
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
