Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.<br>A:high temperature and a high viscosity<br>B:high temperature and a low viscosity<br>C:low temperature and a high viscosity<br>D:low temperature and a low viscosity

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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