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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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