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單項(xiàng)選擇題

When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）

A.CO₂
B.Methyl chloride
C.R-22
D.Sulphur dioxide

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單項(xiàng)選擇題

Which of the following terms is used to identify the pressure of the liquid entering a pump?（）

A.Suction head
B.Pump head
C.Discharge head
D.Total head

單項(xiàng)選擇題

Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.

A.toxic
B.flammable
C.explosive
D.all of the above

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