单选题The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.ApressureBvelocityCflow rateDtemperature
单选题
The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.
A
pressure
B
velocity
C
flow rate
D
temperature
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