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   19518篇
  免费   446篇
财政金融   4109篇
工业经济   1483篇
计划管理   3124篇
经济学   4177篇
综合类   231篇
运输经济   140篇
旅游经济   326篇
贸易经济   3190篇
农业经济   874篇
经济概况   2294篇
信息产业经济   2篇
邮电经济   14篇
  2023年   101篇
  2021年   122篇
  2020年   276篇
  2019年   354篇
  2018年   449篇
  2017年   449篇
  2016年   416篇
  2015年   294篇
  2014年   446篇
  2013年   2246篇
  2012年   524篇
  2011年   659篇
  2010年   593篇
  2009年   632篇
  2008年   572篇
  2007年   515篇
  2006年   452篇
  2005年   395篇
  2004年   382篇
  2003年   413篇
  2002年   399篇
  2001年   376篇
  2000年   412篇
  1999年   411篇
  1998年   425篇
  1997年   378篇
  1996年   317篇
  1995年   329篇
  1994年   321篇
  1993年   319篇
  1992年   329篇
  1991年   331篇
  1990年   267篇
  1989年   234篇
  1988年   218篇
  1987年   217篇
  1986年   229篇
  1985年   332篇
  1984年   343篇
  1983年   323篇
  1982年   286篇
  1981年   265篇
  1980年   234篇
  1979年   233篇
  1978年   224篇
  1977年   200篇
  1976年   186篇
  1975年   194篇
  1974年   154篇
  1973年   138篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Discriminating Among Alternative Theories of the Multinational Enterprise   总被引:6,自引:0,他引:6  
Recent theoretical developments have incorporated endogenous multinational firms into the general–equilibrium model of trade. One simple taxonomy separates the theory into "vertical" models, in which firms geographically separate activities by stages of production, and "horizontal" models, in which multiplant firms duplicate roughly the same activities in many countries. The authors nest a horizontal and a vertical model within a hybrid (unrestricted) "knowledge–capital model" and estimate the specifications with data on US foreign direct investment activity. In the nested econometric tests, the data sample cannot distinguish statistically between the unrestricted model and the restricted horizontal model, indicating that the latter captures virtually all of the determinants of FDI. The tests overwhelmingly reject the vertical model.  相似文献   
62.
63.
64.
65.
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   
66.
67.
Tully S 《Fortune》1995,131(11):98-100, 104, 106
  相似文献   
68.
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   
69.
70.
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