单选题Fog forms when the air（）.Ais 50% water saturatedBis 90% water saturatedCtemperature is greater than the dew point temperatureDtemperature is equal to，or below the dew point temperature
单选题
Fog forms when the air（）.
A
is 50% water saturated
B
is 90% water saturated
C
temperature is greater than the dew point temperature
D
temperature is equal to，or below the dew point temperature
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