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 referenceoil 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。
2
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。
3
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.