全文获取类型
收费全文 | 14237篇 |
免费 | 324篇 |
专业分类
财政金融 | 2979篇 |
工业经济 | 1073篇 |
计划管理 | 2291篇 |
经济学 | 3042篇 |
综合类 | 152篇 |
运输经济 | 100篇 |
旅游经济 | 222篇 |
贸易经济 | 2260篇 |
农业经济 | 629篇 |
经济概况 | 1799篇 |
信息产业经济 | 2篇 |
邮电经济 | 12篇 |
出版年
2023年 | 74篇 |
2021年 | 85篇 |
2020年 | 194篇 |
2019年 | 255篇 |
2018年 | 339篇 |
2017年 | 338篇 |
2016年 | 309篇 |
2015年 | 208篇 |
2014年 | 328篇 |
2013年 | 1598篇 |
2012年 | 389篇 |
2011年 | 470篇 |
2010年 | 427篇 |
2009年 | 444篇 |
2008年 | 409篇 |
2007年 | 358篇 |
2006年 | 335篇 |
2005年 | 262篇 |
2004年 | 270篇 |
2003年 | 273篇 |
2002年 | 271篇 |
2001年 | 278篇 |
2000年 | 292篇 |
1999年 | 293篇 |
1998年 | 302篇 |
1997年 | 265篇 |
1996年 | 224篇 |
1995年 | 220篇 |
1994年 | 235篇 |
1993年 | 241篇 |
1992年 | 265篇 |
1991年 | 256篇 |
1990年 | 200篇 |
1989年 | 182篇 |
1988年 | 167篇 |
1987年 | 163篇 |
1986年 | 168篇 |
1985年 | 237篇 |
1984年 | 255篇 |
1983年 | 245篇 |
1982年 | 212篇 |
1981年 | 194篇 |
1980年 | 168篇 |
1979年 | 168篇 |
1978年 | 157篇 |
1977年 | 133篇 |
1976年 | 123篇 |
1975年 | 139篇 |
1974年 | 99篇 |
1973年 | 102篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
42.
43.
44.
Duke S 《Medical economics》1994,71(4):167-8, 170, 172
45.
Mumford SD 《The Journal of social, political, and economic studies》1995,20(1):35-63
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
46.
47.
48.
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
49.
Mulay S 《Economic and political weekly》1997,32(17):877-879
50.