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
单项选择题 When air is at its dew point it is at its（）
单项选择题 The latent heat of water vapor in air is dependent upon the （）
