单项选择题

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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单项选择题

Which of the following statements is correct concerning the viscosity of lubricating oil?（）

A.Viscosity will increase as temperature increases
B.Viscosity is a measure of a fluid s internal resistance to flow
C.Viscosity will decrease as temperature decreases
D.Viscosity is not dependent on temperature

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Under normal operating conditions, the rudder is hydraulically locked unless （）.

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Saltwater is typically provided to a refrigeration system to （）.

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B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating