If a used lube oil analysis indicates an excessive chromate content, this means （）<br>A:air filtration is inadequate<br>B:engine coolant leaking into the lube oil<br>C:fuel oil is leaking into the lube oil<br>D:the piston rings are excessively worn

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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