Market Analyses on Both Ends of "Power from West to East" from Northwest Region ( Excerption) 西北四省区西电东送两端市场研究报告(摘录)
In chapter four, I talked about how do we collect and collate the data used in sedan marketing system, studied the discrimination and the excerption of primary data and secondary data problem. 在第四章,主要是研究在轿车营销数据库系统中,所需数据的分类以及收集、整理等方面的内容,研究了初级数据、次级数据的甄别选录等问题。
Database excerpted from technological literature considered local characters and national technological requirement for ecological research in Loess Plateau, particularly stressed on data excerption about ecological factor, ecological process and ecological monitor. 数据的选编突出黄土高原生态研究的区域特色和重大科技需求,偏重生态因子、生态过程的试验、监测数据收编,同时注重数据的基础性、客观性、历史性特点。