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Advection fog is most commonly caused by ______.
A.air being warmed above the dew point
B.saturation of cold air by rain
C.a rapid cooling of the air near the surface of the Earth at night
D.warm moist air being blown over a colder surface
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单选题Advection fog is most commonly caused by（）.A
air being warmed above the dew pointB
saturation of cold air by rainC
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单选题Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）A
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Heating the air and then cooling it to a point below dew point
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