Two section furfural extraction process was used to re-extract the deasphalted dewaxing oil and vacuum cut 3 dewaxing oil produced by Jingmen Subsidiary of SINOPEC.
采用两段糠醛抽提工艺，对轻脱脱蜡油和减三线脱蜡油进行了糠醛再抽提试验。
2
A method of using difference images to detect grain pests was described and three - image difference was adopted to re-store and extract the pest images.