單項(xiàng)選擇題

Demulsibility of a lube oil is defined as （）.

A.the ability of oil to separate from water
B.the temperature at which oil flows rapidly
C.a measure of the water in a lube oil system
D.an emulsion of different grades of oil

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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

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