Searching an optimized executive strategy for every complex query is the key of success for database development. In database field, it is still an N-P problem.
对于一个复杂的查询，寻找一个优化的执行策略是数据库系统开发成功的关键所在，此项研究目前在数据库领域仍属于N - P问题。
The production techniques on the Converter-CSP process should be optimized according to the different requirements for the various steel grades, therefore, to improve the p.
应根据薄板坯连铸连轧生产钢种的不同要求，对转炉—薄板连铸连轧生产工艺流程进行合理的优化，提高产品质量，扩大生产品种。
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