单选题Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.Aacidity of the oilBpour point of the oilCflash point of the oilDviscosity of the oil
单选题
Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
A
acidity of the oil
B
pour point of the oil
C
flash point of the oil
D
viscosity of the oil
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