单选题Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.Ahigh temperature and a high viscosityBhigh temperature and a low viscosityClow temperature and a high viscosityDlow temperature and a low viscosity
单选题
Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.
A
high temperature and a high viscosity
B
high temperature and a low viscosity
C
low temperature and a high viscosity
D
low temperature and a low viscosity
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