The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which ...The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which can provide theoretical references for the choice of wastewater treatment process.展开更多
This article briefly and historically reviews the polices of the Organization of Petroleum Exporting Countries （OPEC） and analyzes the factors that facilitate or hinder OPEC＇s monopoly in the crude oil market. The ...This article briefly and historically reviews the polices of the Organization of Petroleum Exporting Countries （OPEC） and analyzes the factors that facilitate or hinder OPEC＇s monopoly in the crude oil market. The industrial concentration ratio is chosen to measure OPEC＇s monopoly power based on the data from 1986 to 2004. It is concluded that OPEC possesses a long-standing cartel foundation and a rather strong monopoly in the world crude oil market. At the same time, there are unstable factors that influence and even weaken OPEC＇s monopoly.展开更多
Since the'Twelfth Five Year Plan'period,China has made considerable progress in the organization and setup of large rare earth groups,layout of rare earth industry has become more rational,the concentration de...Since the'Twelfth Five Year Plan'period,China has made considerable progress in the organization and setup of large rare earth groups,layout of rare earth industry has become more rational,the concentration degree has increased significantly,the previously small,scattered,and chaotic situation has basically been reversed.展开更多
文摘The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which can provide theoretical references for the choice of wastewater treatment process.
文摘This article briefly and historically reviews the polices of the Organization of Petroleum Exporting Countries （OPEC） and analyzes the factors that facilitate or hinder OPEC＇s monopoly in the crude oil market. The industrial concentration ratio is chosen to measure OPEC＇s monopoly power based on the data from 1986 to 2004. It is concluded that OPEC possesses a long-standing cartel foundation and a rather strong monopoly in the world crude oil market. At the same time, there are unstable factors that influence and even weaken OPEC＇s monopoly.
文摘Since the'Twelfth Five Year Plan'period,China has made considerable progress in the organization and setup of large rare earth groups,layout of rare earth industry has become more rational,the concentration degree has increased significantly,the previously small,scattered,and chaotic situation has basically been reversed.
