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
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相关考题
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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 -
单项选择题
The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.
A.passing it through the expansion valve
B.condensing refrigerant in the system condenser
C.passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
D.maintaining a high pressure on the systems receiver
