单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.Acontaminated with sludgeBcontaminated with carbonCdiluted with fuel oilDdiluted with water
单选题
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.
A
contaminated with sludge
B
contaminated with carbon
C
diluted with fuel oil
D
diluted with water
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