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單項(xiàng)選擇題

If liquid refrigerant accidentally comes in contact with the eyes, （） immediately.

A.rub the eyes
B.irritate the eyes
C.wash the eyes with a heavy boric acid solution
D.obtain medical help

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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

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