Considering factors of extraction efficiency, oil yield and environmental protection, the ultrasonic extraction and the supercritical carbon dioxide fluid extraction are the appropriate methods.
从提取效率、油的得率及绿色环保几个因素综合考虑，超声波提取法和超临界二氧化碳萃取法是比较理想的两种提取方法。
The features and developing trend of modern cutting fluid technology in the case of higher requirements for performances and environmental protection are introduced.
综述了在对切削液性能要求和环保要求日益提高的情况下现代切削液技术的特点及发展趋势。
Enzymatic digestion method should been selected if safety and environmental protection were considered, or the drowning fluid was sea water and less diatoms were found in it.
从安全性和环保角度考虑，或当溺液为海水及硅藻密度较小时，应选择酶消化法；
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