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單項(xiàng)選擇題

（） is the circulation and refreshing of the air in a space without necessarily a change of temperature.

A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating

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單項(xiàng)選擇題

（） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.

A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating

單項(xiàng)選擇題

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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