单项选择题
To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid
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相关考题
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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?（）
A.Air or Nitrogen
B.Seawater or Fresh water
C.Sodium Nitrate brine
D.Calcium Sulfate brine -
单项选择题
The effective temperature of air is dependent upon（） Ⅰ.relative humidity Ⅱ.air velocity
A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.NeitherⅠnor Ⅱ -
单项选择题
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
