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   1594篇
  免费   87篇
各国政治   84篇
工人农民   85篇
世界政治   109篇
外交国际关系   127篇
法律   862篇
中国政治   11篇
政治理论   389篇
综合类   14篇
  2023年   20篇
  2022年   18篇
  2021年   20篇
  2020年   39篇
  2019年   53篇
  2018年   61篇
  2017年   77篇
  2016年   77篇
  2015年   50篇
  2014年   71篇
  2013年   215篇
  2012年   64篇
  2011年   50篇
  2010年   49篇
  2009年   49篇
  2008年   57篇
  2007年   74篇
  2006年   62篇
  2005年   60篇
  2004年   45篇
  2003年   43篇
  2002年   56篇
  2001年   30篇
  2000年   30篇
  1999年   36篇
  1998年   22篇
  1997年   15篇
  1996年   10篇
  1995年   20篇
  1994年   18篇
  1993年   12篇
  1992年   26篇
  1991年   15篇
  1990年   9篇
  1989年   11篇
  1988年   14篇
  1987年   9篇
  1986年   10篇
  1985年   12篇
  1984年   10篇
  1983年   9篇
  1982年   8篇
  1980年   5篇
  1976年   6篇
  1975年   4篇
  1972年   2篇
  1971年   4篇
  1970年   2篇
  1969年   3篇
  1966年   5篇
排序方式: 共有1681条查询结果,搜索用时 15 毫秒
151.
152.
153.
Is the modern states system in terminal decline? Are we witnessing a great transformation in that regard? Are the events of 9/11 indicative of that? Or is state sovereignty evolving, yet again, in response to scientific, technological, economic and social changes – as it has done throughout the post-medieval era of its existence? That latter line of argument is put forward in this essay.  相似文献   
154.
155.
156.
Business Development Services (BDS) programmes have become big business for international donors and NGOs. Focusing on small enterprises in developing countries, the current BDS approach assumes that the development of commercial markets is the key to success. Yet many of these programmes continue to have a limited impact. A review of modern theories of innovation and services marketing management suggests that this may be because current BDS support practice reflects a rather limited understanding of how new markets actually develop. Drawing on the insights that these theories offer, the authors suggest that BDS practice should develop a more evolutionary approach, recognising that service innovations develop through active, on-going interaction between suppliers and customers. The article concludes with practical policy guidelines and a discussion about tools that could help BDS to adopt this more successful approach.  相似文献   
157.
In an effort to balance static and dynamic efficiency in the production and use of knowledge, societies institute intellectual property policies. In the United States, the patent system is a well-established mechanism to provide inventors with time-limited protection of new technologies in exchange for disclosure of information about their inventions. Emerging biotechnology, specifically the filing of patents on gene sequences, raises serious questions about whether the patent system is appropriately weighing societal costs and benefits in its grants of intellectual property protection. Gene sequences represent a hybrid case between discrete inventions and more general pieces of information that are useful for many, potentially very different, purposes. This information content in genes makes it possible for a patent on a gene to cover a wide range of possible technological applications and, as a result, be of unknown breadth when issued. This analysis explores the potential effect of these characteristics on future innovation in biotechnology. Copyright 2003 by the Association for Public Policy Analysis and Management.  相似文献   
158.
159.
The value of the acid phosphatase spot test in the primary visualization and identification of seminal traces is hampered by the sensitiveness of the enzyme to biodegradation. An alternative spot test is proposed, based on the high concentration of the more stable zinc metal in seminal plasma. The proposed zinc spot test is simple and suitable for on site investigation. Although the sensitivity in fresh stains is lower than that of the acid phosphatase spot test, this is largely compensated by the lower sensitiveness to biodegradation. The specificity for semen is higher than that of the acid phosphatase spot test. In vaginal swabs it was nevertheless seen, that samples should be taken within 24 h after alleged sexual assault to give reliable results.  相似文献   
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