单项选择题

Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction

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单项选择题

The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

A.weight designation
B.viscosity index
C.pour point
D.thermal change value

单项选择题

The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.

A.fusion
B.vaporization
C.condensation
D.sublimation

单项选择题

With reference to a vessel’s structural integrity, the most significant characteristic of a cryogenic liquid is its （）.

A.capability of causing brittle fractures
B.highly corrosive action on mild steel
C.vapor cloud which reacts violently with saltwater
D.toxicity at atmospheric pressure