全文获取类型
收费全文 | 13618篇 |
免费 | 299篇 |
国内免费 | 13篇 |
专业分类
财政金融 | 2384篇 |
工业经济 | 1051篇 |
计划管理 | 2260篇 |
经济学 | 2905篇 |
综合类 | 299篇 |
运输经济 | 88篇 |
旅游经济 | 276篇 |
贸易经济 | 2458篇 |
农业经济 | 735篇 |
经济概况 | 1451篇 |
邮电经济 | 23篇 |
出版年
2021年 | 84篇 |
2020年 | 147篇 |
2019年 | 217篇 |
2018年 | 278篇 |
2017年 | 311篇 |
2016年 | 290篇 |
2015年 | 204篇 |
2014年 | 317篇 |
2013年 | 1296篇 |
2012年 | 356篇 |
2011年 | 379篇 |
2010年 | 366篇 |
2009年 | 391篇 |
2008年 | 442篇 |
2007年 | 418篇 |
2006年 | 338篇 |
2005年 | 331篇 |
2004年 | 293篇 |
2003年 | 300篇 |
2002年 | 278篇 |
2001年 | 271篇 |
2000年 | 275篇 |
1999年 | 246篇 |
1998年 | 254篇 |
1997年 | 260篇 |
1996年 | 260篇 |
1995年 | 236篇 |
1994年 | 226篇 |
1993年 | 248篇 |
1992年 | 235篇 |
1991年 | 227篇 |
1990年 | 211篇 |
1989年 | 184篇 |
1988年 | 143篇 |
1987年 | 175篇 |
1986年 | 175篇 |
1985年 | 259篇 |
1984年 | 269篇 |
1983年 | 262篇 |
1982年 | 233篇 |
1981年 | 234篇 |
1980年 | 198篇 |
1979年 | 209篇 |
1978年 | 151篇 |
1977年 | 157篇 |
1976年 | 135篇 |
1975年 | 108篇 |
1974年 | 102篇 |
1973年 | 93篇 |
1972年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Poverty,population and environmental degradation in China 总被引:7,自引:0,他引:7
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
62.
Finger AL 《Medical economics》1997,74(17):59-60, 63-4
63.
Finger AL 《Medical economics》1997,74(8):79-80, 85-8, 93
64.
Finger AL 《Medical economics》1997,74(24):101-4, 107
65.
Biersack KL 《Medical economics》1997,74(2):92, 95, 100 passim
66.
Finger AL 《Medical economics》1997,74(21):105-6, 108, 113-7
67.
68.
Belkin L 《Medical economics》1993,70(6):160-1, 165-8, 171-2 passim
69.
W L Nkuhlu 《Development Southern Africa》1984,1(3-4):333-342
This paper identifies the main issues that development in Transkei must address. These are job creation, food production and the upgrading of manpower productivity through appropriate education and training.
The first section gives statistical information on unemployment and food production. The second part discusses national development priorities and strategies as determined by the economic development planners and approved by the Government. The emphasis of the plan is small scale operations that can be operated and managed by the people themselves. The third section examines the development that is actually taking place against the approved national development priorities. Finally some of the policies and practices that are in conflict with what the country is seeking to achieve are highlighted. 相似文献
70.