单项选择题

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

A.weight
B.internal friction
C.demulsibility

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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

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 （）.

A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear