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   20573篇
  免费   654篇
各国政治   919篇
工人农民   751篇
世界政治   1817篇
外交国际关系   791篇
法律   11709篇
中国共产党   2篇
中国政治   92篇
政治理论   4939篇
综合类   207篇
  2020年   247篇
  2019年   299篇
  2018年   412篇
  2017年   479篇
  2016年   536篇
  2015年   364篇
  2014年   390篇
  2013年   2228篇
  2012年   497篇
  2011年   507篇
  2010年   432篇
  2009年   489篇
  2008年   542篇
  2007年   574篇
  2006年   550篇
  2005年   498篇
  2004年   495篇
  2003年   514篇
  2002年   469篇
  2001年   741篇
  2000年   687篇
  1999年   565篇
  1998年   372篇
  1997年   306篇
  1996年   235篇
  1995年   269篇
  1994年   297篇
  1993年   272篇
  1992年   397篇
  1991年   410篇
  1990年   372篇
  1989年   399篇
  1988年   371篇
  1987年   392篇
  1986年   389篇
  1985年   393篇
  1984年   342篇
  1983年   358篇
  1982年   303篇
  1981年   284篇
  1980年   211篇
  1979年   283篇
  1978年   197篇
  1977年   175篇
  1976年   154篇
  1975年   140篇
  1974年   153篇
  1973年   136篇
  1972年   126篇
  1969年   102篇
排序方式: 共有10000条查询结果,搜索用时 17 毫秒
151.
152.
153.
154.
More than a decade after NAFTA (North American Free Trade Agreement) entered into force, the environmental effects of agricultural trade liberalization in Mexico are still controversial, emerging, and not fully understood. This paper contributes to the literature that aims to explore trends in input use in the agricultural sector in Mexico during the post-NAFTA period among both commercial/industrial and traditional/rainfed farmers, and examines the influence of the national and multilateral institutional framework on these outcomes. We decompose the post-NAFTA agricultural production data into scale, technique and composition effects to estimate the impact that trade liberalization has had on the use of fertilizer and land use, two key agricultural inputs for which reliable aggregate data is available. We conclude that among commercial farmers patterns of crop type specialization and significant technological improvements have led to some declines in fertilizer use but they have been offset by growth in fertilizer use associated with growing agricultural output. Among traditional farmers increased output and specialization in land-intensive grain crops are contributing to an increase in land under cultivation and technological improvements show the potential, but not yet not the strength, to counteract these effects. We analyse the environmental institutional framework and rural development plans, observing that institutional weaknesses have, in several instances, reduced the environmental benefit of technique and composition effects. We conclude with recommendations about how the Mexican agricultural sector might reap the environmental benefits of international agricultural trade.  相似文献   
155.
Of War and Law     
Netherlands International Law Review -  相似文献   
156.
157.
158.
The end of the twentieth century was marked by a sea change in global governance in the realm of intellectual property rights (IPRs). Whereas countries historically retained substantial autonomy with regard to what they defined as intellectual "property" and the rights granted to the owners of intellectual property, the 1990s witnessed the establishment of new global obligations regarding national practices. This paper focuses on the case of software "piracy" to assess the mechanisms by which the new global obligations for the treatment of IPRs are transmitted from the international to the national levels. We first consider a set of national-level factors that many scholars have shown to be important determinants of IPR policy. We then supplement the standard emphasis on domestic factors with an analysis of new transnational factors: countries' multilateral obligations under the World Trade Organization's (WTO) Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) and bilateral pressures from the United States to increase the protection of IPRs. Population-averaged panel data models are used to assess the effects of these national and transnational determinants on levels of software piracy in 80 countries from 1994 to 2002. Our results indicate that membership in the WTO and bilateral pressures from the United States—particularly pressures that offer reciprocal concessions—lead to substantial increases in levels of protection in rich and poor countries. There is, in short, a new international political economy of intellectual property.  相似文献   
159.
160.
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