单选题If a used lube oil analysis indicates an excessive chromate content, this means （）Aair filtration is inadequateBengine coolant leaking into the lube oilCfuel oil is leaking into the lube oilDthe piston rings are excessively worn
单选题
If a used lube oil analysis indicates an excessive chromate content, this means （）
A
air filtration is inadequate
B
engine coolant leaking into the lube oil
C
fuel oil is leaking into the lube oil
D
the piston rings are excessively worn
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