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   68239篇
  免费   3327篇
各国政治   4554篇
工人农民   2867篇
世界政治   6038篇
外交国际关系   3879篇
法律   31488篇
中国共产党   9篇
中国政治   757篇
政治理论   21022篇
综合类   952篇
  2021年   408篇
  2020年   1170篇
  2019年   1533篇
  2018年   1692篇
  2017年   1983篇
  2016年   2188篇
  2015年   1850篇
  2014年   2118篇
  2013年   10702篇
  2012年   1613篇
  2011年   1714篇
  2010年   1846篇
  2009年   2096篇
  2008年   1756篇
  2007年   1738篇
  2006年   1893篇
  2005年   1795篇
  2004年   1681篇
  2003年   1485篇
  2002年   1539篇
  2001年   1442篇
  2000年   1253篇
  1999年   1135篇
  1998年   1111篇
  1997年   979篇
  1996年   943篇
  1995年   919篇
  1994年   909篇
  1993年   943篇
  1992年   924篇
  1991年   958篇
  1990年   903篇
  1989年   955篇
  1988年   952篇
  1987年   979篇
  1986年   946篇
  1985年   1029篇
  1984年   916篇
  1983年   976篇
  1982年   900篇
  1981年   857篇
  1980年   661篇
  1979年   691篇
  1978年   600篇
  1977年   540篇
  1976年   495篇
  1975年   416篇
  1974年   417篇
  1973年   431篇
  1972年   372篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
191.
The failure of forestry to contribute to poverty reduction in Central America is due to public policies which inhibit its profitability. Absence of public regulation of harvesting and competing subsidies to agriculture keep forestry stumpage prices artificially low. This encourages destruction of the forest resource, which damages both the environment and the potential to reduce poverty. A comparison of Costa Rica and Honduras reveals two dissimilar approaches toward forest policy. While Costa Rica attempts to raise producer and grower stumpage prices by tax credits, soft loans and differential species fees, Honduras enforces price ceilings and uses centralized authority to control forest production and export. Both countries exhibit weaknesses in the management control cycle of programming, budgeting, implementing and evaluating their forest policies. Yet the Costa Rican approach has increased stumpage prices already, which bodes well for their forest sector. By contrast, the major beneficiary of Honduran forest policy has been COHDEFOR, the state enterprise responsible for forestry management, controlling production, and running its national system of agroforestry cooperatives. Despite greater public authority and resources than the Costa Rican forest service (DGF), the Honduran forest policy is not likely to increase producer profitability or reduce poverty in the near future.  相似文献   
192.
Provincial governments in the Netherlands have only one general tax at their disposal. However, it has become an insufficient source of revenue for this level of government in the Dutch system. To increase the revenue raising capacity of the provincial governments, thirteen broad-based general tax proposals not used at the local level were examined. The objective was to find a fair and equitable tax that could easily be collected and would result in fl. 200 million in additional revenue for the provincial governments.  相似文献   
193.
194.
195.
196.
197.
198.
New York State experimented with replacing their litigation-oriented system for achieving toxic dump site cleanup with one promising to lower transaction costs through alternative dispute resolution. Our analysis of outcomes is informed by three generations of implementation work focusing on (1) the motivations and incentives shaping individual behavior, (2) the larger organizational and political factors associated with variation across cases, and (3) the generic properties of policy implements. This mosaic approach to explanation produces, we believe, a more lifelike picture of use to policy makers for understanding the dynamic and interrelated nature of their choices.  相似文献   
199.
The process is not the problem, the problem is the problem. Rudolph Penner (1984). …We argue the superiority of the outcome from the process, not of the process from the outcome. The constancy of the economist's objection to this conclusion when applied to governmental rather than market decisions simply often reflects the fact that, while some economists are not disturbed that consumer preferences lead to allocation policies other than best respond to their own tastes, when political preferences lead to governmental policies not consistent with his informed and considered preferences, they are tempted to attribute irrationality to government.  相似文献   
200.
The EPA implements its policy of exhaust emission control by setting standards specified in terms of grams of pollutants per mile traveled. As a result, the tax must first restrain the vehicle miles traveled (VMT) if it is to have an impact on emission at all. EPA's choice of miles traveled as the medium through which its policy of pollution control must run is unfortunate, because travel is an activity that people resist giving up. This is reflected in a low long-run price elasticity of travel demand. Consequently, it takes substantial increases in the gasoline tax to make an impact on long-run travel demand. Simulation results show that under an alternative policy option, where EPA's standards are specified in terms of grams of pollutant per gallon of fuel burned, the same long-run reduction in exhaust emissions achievable today can be achieved (at an even higher level of confidence) with less than one-tenth of the increase in gasoline price required under the existing policy regime.  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