We keep only a compound primary key and a secondary index for each row, and answer all queries from a single index.
我们只保留了一个组合主键和一个辅助索引来完成所有的查询。
2
For chemical compound flooding, it emphasizes the combination among core study, numerical simulation and pilot test, and secondary mechanism study in the view of reservoir engineering.
在化学复合驱方面，强调岩心、数模和矿场试验紧密结合，从油藏工程角度开展二次机理研究。
3
There exits a compound error problem in the electrical measurement, which is composed of PT synthetic error, ct synthetic error, electrical energy measurement error and secondary potential of PT.