单选题Sludge formation in a diesel engine lube oil system is caused by（）Acarbonization of oils from the combustion chambersBemulsions of lube oil and waterCcoagulation of unburned fuel below the piston ringsDall of the above
单选题
Sludge formation in a diesel engine lube oil system is caused by（）
A
carbonization of oils from the combustion chambers
B
emulsions of lube oil and water
C
coagulation of unburned fuel below the piston rings
D
all of the above
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