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   7444篇
  免费   175篇
各国政治   395篇
工人农民   193篇
世界政治   475篇
外交国际关系   288篇
法律   4676篇
中国共产党   1篇
中国政治   19篇
政治理论   1477篇
综合类   95篇
  2020年   64篇
  2019年   85篇
  2018年   126篇
  2017年   136篇
  2016年   153篇
  2015年   113篇
  2014年   127篇
  2013年   809篇
  2012年   205篇
  2011年   207篇
  2010年   156篇
  2009年   166篇
  2008年   200篇
  2007年   176篇
  2006年   186篇
  2005年   147篇
  2004年   153篇
  2003年   158篇
  2002年   167篇
  2001年   313篇
  2000年   282篇
  1999年   224篇
  1998年   87篇
  1997年   108篇
  1996年   80篇
  1995年   81篇
  1994年   92篇
  1993年   82篇
  1992年   160篇
  1991年   175篇
  1990年   157篇
  1989年   171篇
  1988年   148篇
  1987年   145篇
  1986年   168篇
  1985年   131篇
  1984年   125篇
  1983年   132篇
  1982年   79篇
  1981年   77篇
  1980年   60篇
  1979年   112篇
  1978年   66篇
  1977年   63篇
  1976年   56篇
  1975年   67篇
  1974年   83篇
  1973年   77篇
  1972年   67篇
  1971年   60篇
排序方式: 共有7619条查询结果,搜索用时 15 毫秒
951.
952.
953.
954.
955.
Saliva and saliva-stained materials were examined as potential sources of deoxyribonucleic acid (DNA) for DNA analysis and identity testing. In this paper, the authors demonstrate that DNA was isolated and DNA banding patterns suitable for DNA typing were obtained from fresh saliva and various saliva-stained materials, such as envelopes, buccal swabs, gags, and cigarettes. Furthermore, DNA and DNA banding patterns were obtained from actual forensic evidentiary samples containing mixed saliva/semen stains. The DNA banding patterns obtained from saliva or saliva-stained material were indistinguishable from the patterns obtained from blood or hair from the same individual. Intact DNA was readily isolated and DNA banding patterns were obtained from saliva stored at -20 degrees C and dried saliva stains stored under varying conditions. We conclude that saliva and saliva-stained material can be good sources of DNA for analysis and for DNA typing in certain forensic settings.  相似文献   
956.
Blood stains on a knife were identified by DNA genotyposcopy. The statistical validation method has confirmed that the blood stains on material evidence belonged to the victim, the probability of random coincidence being less than 10(-11). The efficacy of using hypervariable locus-specific DNA probes and the possibility of detecting DNA impressions in blood stains stored for more than 3 months have been demonstrated.  相似文献   
957.
This paper tests empirically the Ramsey version of the public-interest theory of regulation by examining the pricing practices in the nuclear power industry, using a 1985 cross-sectional sample of 40 electric utilities. Other researchers have avoided this segment of the industry because of difficulties with nuclear fuel data, or perceived differences in the underlying production function. We show that regulators respond to political influences according to the Stigler-Peltzman version of regulation and that Ramsey pricing cannot be validated, at least for the nuclear segment of the electric power industry.  相似文献   
958.
959.
This article surveys political development frameworks for analyzing the post-Communist transition to political democracy. Parallels with postcolonial events in Third World countries should caution against overoptimism about the prospects for mutually reinforcing economic and political development. In general, the study of Third World political development suggest that rapid regime transition with low mass participation is unlikely to result in sustainable democratic politics, especially where severe economic dislocations are present. High rates of participation during regime change may lead to rapid disillusionment with the performance of postrevolutionary government. It is thus argued that states wishing, for various reasons, to assist in smoothing the transition from communism should pay heed to the cautionary experience of Third World development assistance and monitor the political dimensions of the transformation, such as the stability of coalition governments, electoral turnout, ethnonationalism, as well as the orthodox economic indicators like inflation and rates of domestic investment. With respect to international assistance to the former Communist countries of Eastern and Central Europe, the article shows that the capacity of the Group of Twenty Four (G-24) donors to aid economic recovery is well below what is requested, or needed. Despite hosting a donor summit, the United States is taking a far less prominent role in the post-Cold War donor community than was the case in the analogous program for post-World War II recovery. This is having an impact on both volume and coordination of assistance. Finally, a strong, possibly ideological, preference among donors for finding private sector recipients for the bulk of assistance may erode the capacity of the post-Communist states to provide both infrastructure and political stability needed for investor confidence. Those making decisions about levels and modes of Western assistance should look beyond economic indicators of privatization as criteria for continued support and retain, where possible, political development objectives in both financial and project assistance. While we must not assume that the record of supporting democracy in Central and Eastern Europe will prove to be any better than in many Third World regimes, the greater security salience of Eastern Europe’s stability adds urgency to the task of applying political development lessons to the post-Communist experience. Malcolm J. Grieve specializes in political development and international political economy and in his current research is exploring the connections between the two fields with regard to analysis of the post-Communist transition. Recent publications include “Economic Imperialism”, in D. Haglund and M. Hawes, eds.,World Politics: Power, Interdependence and Dependence (Harcourt Brace Jovanovich, 1990) and “Debt and Imperialism: Perspectives on the Debt Crisis,” in S. Riley ed.,The politics of global debt (Macmillan 1993). ...in Central and eastern Europe, we are seeking to demonstrate in practice the idea that free government can mean good and stable government, and that free enterprise can mean economic opportunity for all.U.S. Deputy Secretary of State, Lawrence S. Eagleburger, 27 February 1991. There is nothing more difficult to arrange, more doubtful of success, and more dangerous to carry through, than to initiate a new order of things.Machiavelli, The Prince  相似文献   
960.
Study of dental root surfaces prompted the authors to add to the routine odontogram 28 more maxillary surfaces and 22 mandibular surfaces, this making a total of 210 diagnostic signs. Employment of amplified panoramic roentgenography permitted the authors to detect specific features of the dental cavity, root canals, periodontal fissure structure, the presence of caries and its complications, inflammatory and systemic involvement, injury to the jaws and teeth. Visual examination of dental status and application of panoramic roentgenography will help improve forensic medical personal identification.  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