單項選擇題

Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

A.are exposed to a vacuum
B.come in contact with extremely hot surfaces
C.are reduced in temperature to just above the pour point
D.become extremely agitated or aerated

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單項選擇題

The viscosity of an oil is a measure of its （）.

A.weight
B.internal friction
C.demulsibility

單項選擇題

The pour point of lubricating oils is affected the most by which of the following?（）

A.Extensive centrifuging
B.Wax content
C.Water content
D.Acid content

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Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

你可能感興趣的試題

The viscosity of an oil is a measure of its （）.

The pour point of lubricating oils is affected the most by which of the following?（）