This paper introduces the characteristics and differences of multi-grade oil and one-grade oil, the points for attention of selecting multi-grade oil are presented.
在简述了多级油与单级油的特点与区别后，指出了多级油选择与使用中应注意的事项。
The 2-order grey relational grade method for solving the optimization of development alternatives with multi-objective function in multi-block-multilayer oil and gas field is developed.
针对多断块、多层系油气田开发方案优选的多目标性，提出了用二阶灰色关联度求解的方法。
应用推荐