oil grade是什么意思

网络释义

1)oil grade,油等级2)fuel grade,燃油等级3)cd oil level,cd机油等级4)oil step,油等级，油压分段5)power level of diesel engine,柴油机功率等级6)contamination level,油液污染度等级

The standard of oil contamination level and measurement;

油液污染度等级标准及其测定