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單項(xiàng)選擇題

Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with（）.

A.fresh water
B.fresh air
C.salt water
D.artificial respiration

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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

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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