单选题Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.Aunder high pressureBunder low pressureCheated to reduce viscosityDcooled to increase viscosity
单选题
Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
A
under high pressure
B
under low pressure
C
heated to reduce viscosity
D
cooled to increase viscosity
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