单选题The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.Aweight designationBviscosity indexCpour pointDthermal change value
单选题
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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