单选题Diesel engine lube oil can become contaminated as a result（）Athe water produced during combustionBthe sulfur in the fuelCunburned fuel oilDall of the above
单选题
Diesel engine lube oil can become contaminated as a result（）
A
the water produced during combustion
B
the sulfur in the fuel
C
unburned fuel oil
D
all of the above
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