... gulfinning 海湾精制法 high viscosity solvent refined oil 高粘度溶剂精制油 highly refined 高度精制的 ...
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Bright stock Refined, high viscosity lubricating oil usually made residual stocks by suitable treatment, such as a combination of acid treatment or solvent extraction with dewaxing or clay finishing.
加工处理的方式包括：酸处理(或溶剂萃取)脱蜡(或粘土精制)相结合。
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