首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   30782篇
  免费   327篇
财政金融   5607篇
工业经济   1824篇
计划管理   4824篇
经济学   6876篇
综合类   610篇
运输经济   108篇
旅游经济   225篇
贸易经济   6678篇
农业经济   633篇
经济概况   3097篇
信息产业经济   46篇
邮电经济   581篇
  2023年   78篇
  2021年   91篇
  2020年   198篇
  2019年   262篇
  2018年   2578篇
  2017年   2336篇
  2016年   1503篇
  2015年   293篇
  2014年   423篇
  2013年   1681篇
  2012年   810篇
  2011年   2357篇
  2010年   2206篇
  2009年   1926篇
  2008年   1885篇
  2007年   2184篇
  2006年   406篇
  2005年   651篇
  2004年   729篇
  2003年   818篇
  2002年   527篇
  2001年   345篇
  2000年   345篇
  1999年   302篇
  1998年   322篇
  1997年   269篇
  1996年   240篇
  1995年   228篇
  1994年   237篇
  1993年   245篇
  1992年   269篇
  1991年   256篇
  1990年   202篇
  1989年   183篇
  1988年   168篇
  1987年   163篇
  1986年   189篇
  1985年   243篇
  1984年   256篇
  1983年   246篇
  1982年   216篇
  1981年   199篇
  1980年   171篇
  1979年   169篇
  1978年   157篇
  1977年   137篇
  1976年   125篇
  1975年   146篇
  1974年   102篇
  1973年   103篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
This paper was published in the wake of Pope John Paul II's encyclical 'Evangelicum Vitae', which condemns abortion and contraception. The author describes how, in the mid-1970's, the Vatican blocked the implementation of President Nixon's 'National Security Study Memorandum 200', which was intended to combat global overpopulation. The author explains that excessive population growth is considered threatening to U.S. security interests, and concludes that "papal security-survival along with the influence of fundamentalist Protestant opposition to birth control is now pitted against the U.S. and world security-survival."  相似文献   
82.
83.
Tully S 《Fortune》1995,131(11):98-100, 104, 106
  相似文献   
84.
Poverty,population and environmental degradation in China   总被引:7,自引:0,他引:7  
Rozelle S  Huang J  Zhang L 《Food Policy》1997,22(3):229-251
This article examines the relationship between poverty, population, and environmental degradation in China. Environmental conditions include water pollution, deforestation, destruction of grasslands, soil erosion, and salinization. The authors review China's success in controlling environmental degradation through leadership, environmental policies, and institutional capacity. Findings suggest that environmental progress is best achieved indirectly by poverty alleviation, market integration, and population control. Government policies were not very effective. Degradation occurs due to limited financial resources, poorly trained personnel, and political factors. Control of water pollution was instituted since the 1980s. The levels of pollutants have been reduced, but the type of pollutant determines the seriousness of impact. Water pollution is due to industrial wastes, agricultural run-off, and soil erosion. Since the 1970s, reforestation targets have not been met. Technical extension and monitoring of planting is not available in most areas, and private, profit seeking interests control acreage. Grassland destruction is due to deforestation, agricultural expansion, and overgrazing. Independent regional authorities have successfully managed pasture programs. Erosion is the most serious in Loess Plateau, the Red Soils area, the Northeast China Plain, and the Northwest Grasslands, which comprise 70% of total land area. In 1990, erosion control was practiced in 39% of eroded land area. Salinization has remained fairly constant. Environmental controls (direct regulation, planned recovery, and state-mandated technological improvements) are uneven. The main tool for environmental management is the State Environmental Protection Commission and its executive unit, SEPA. Problems stem from vague laws, lack of means of enforcement, lack of coordination of laws, and lack of standards, schedules, and other provisions in ordinances.  相似文献   
85.
86.
87.
Ratan S 《Fortune》1993,128(9):63-64
In an exclusive poll, they mostly say they accept Clinton's goal of universal health care. But they're deeply skeptical of his approach and fear its effects.  相似文献   
88.
89.
90.
Luxenberg S 《Medical economics》1993,70(13):19-20, 22
By permitting depreciation of patient lists, the judges gave both buyers and sellers of medical practices a chance to make a better--but not great--deal.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号