單項(xiàng)選擇題

An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

A.have a high viscosity index
B.mix readily with refrigerant
C.have a high freezing point
D.have a low pour point

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單項(xiàng)選擇題

Properties of a good refrigeration oil include（）

A.low wax content
B.high pour point
C.high viscosity
D.all of the above

單項(xiàng)選擇題

Proper filtering and straining of diesel fuel is important because the（）

A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of grit in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil dirty
D.fuel will clog the intake air filter