单选题One of the functions of ventilation is to （） the humidity of spaces containing sources of moisture, or to （） the temperature of spaces not mechanically cooled such as the engine room.Aincrease；reduceBreduce；increaseCincrease；increaseDreduce；reduce
单选题
One of the functions of ventilation is to （） the humidity of spaces containing sources of moisture, or to （） the temperature of spaces not mechanically cooled such as the engine room.
A
increase；reduce
B
reduce；increase
C
increase；increase
D
reduce；reduce
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