单项选择题
A.Overcoming sliding friction B.Overcoming rolling friction C.Overcoming fluid friction D.Overcoming oil wedge friction
The degree to which the viscosity of an oil will change...
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
The heat required to change a substance from a solid to...
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
With reference to a vessel’s structural integrity, the ...
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
