If you are blending oils, you will need a dropper pipette for each raw oil you use.

如果需要混合精油，还需要一根滴管来吸取你要用的精油。

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Esterification and transesterification are the most common methods of producing biodiesel. It is important to select an appropriate catalyst based on the properties of raw oil.

酯化及转酯化法是目前研究最多、最具优势的生物柴油制备方法，根据原料特性选择合适的催化剂是该法成功的重要保证。

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Oil sludge is produced in the process of raw oil dehydrating in oil field corporations and oily sewage disposal in the petrochemical industry factories.

含油污泥主要产生于油田企业对原油脱水以及油田和炼油厂等石化行业的污水处理部门对含油污水的处理过程中。

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For a car, of course you need raw crude oil, and then refineries to make gasoline and transportation networks to deliver it.

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