Organic solvents, such as petroleum ether and gasoline, are used as extracting agents to measure oil content in oilfield waste water and the normal curves of reference oil are plotted.

油田污水中含油量的测定采用石油醚、汽油等有机溶剂作萃取剂，绘制标准油的标准曲线。

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The mute oil free compressor parameters interpretation for the masses of users, the following reference use.

现就静音无油空压机的参数解读如下，供广大用户参考使用。

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By analysis of explosion accident of high voltage little oil circuit breaker, found out the weak link existed on this breaker, for which proposes some Suggestions for reader reference.

通过分析一起高压少油断路器爆炸事故，从中找出断路器本身存在的薄弱环节，为此提出一些改进建议供读者参考。

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They cannot actually set a reference price for globally traded crude oil, and what ability they once had to balance the market has declined as traders have become more skeptical that the Kingdom is ready and willing to ramp up its production as much as it says it can.

FORBES: Is The White House The New Federal Reserve Of Oil?

The claim was made on the basis of a 2006 Ecuadorian law (Law 42) by which the government has a right to 99% of the oil revenues above a certain "reference price", mostly arbitrary.

CENTERFORSECURITYPOLICY: Center For Security Policy