单项选择题
The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the（）.
A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity
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Which of the following statements is correct relative to distillation plant operation?（）
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单项选择题
The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called （）.
A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity
