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用康氏法测量了在室温下航空润滑油ＨＨ－２０与ＨＰ－８的任意体积比的混合航空润滑油的残炭值。实验结果表明，样品中ＨＰ－８与ＨＨ－２０的体积比值与其残炭值呈良好的线性关系。因此，通过混合航空润滑油体积比的测量就可直接读出该油品的准确的残炭值。
The residual carbon value of mixed aviation lubricating oil of any volume ratio of aviation lubricating oil HH-20 and HP-8 at room temperature was measured by Converse method. The experimental results show that there is a good linear relationship between the volume ratio of HP-8 and HH-20 in the sample and its residual carbon value. Therefore, by measuring the volume ratio of the mixed aviation lubricating oil, the accurate residual carbon value of the oil can be read directly.