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   12811篇
  免费   694篇
各国政治   718篇
工人农民   444篇
世界政治   1106篇
外交国际关系   663篇
法律   7478篇
中国政治   81篇
政治理论   2923篇
综合类   92篇
  2023年   77篇
  2021年   78篇
  2020年   245篇
  2019年   291篇
  2018年   393篇
  2017年   416篇
  2016年   478篇
  2015年   349篇
  2014年   337篇
  2013年   1655篇
  2012年   342篇
  2011年   352篇
  2010年   354篇
  2009年   395篇
  2008年   371篇
  2007年   397篇
  2006年   386篇
  2005年   363篇
  2004年   379篇
  2003年   337篇
  2002年   313篇
  2001年   422篇
  2000年   355篇
  1999年   336篇
  1998年   179篇
  1997年   155篇
  1996年   140篇
  1995年   144篇
  1994年   159篇
  1993年   166篇
  1992年   217篇
  1991年   217篇
  1990年   206篇
  1989年   208篇
  1988年   185篇
  1987年   178篇
  1986年   174篇
  1985年   172篇
  1984年   142篇
  1983年   148篇
  1982年   112篇
  1981年   109篇
  1980年   74篇
  1979年   128篇
  1978年   92篇
  1977年   76篇
  1976年   64篇
  1975年   63篇
  1974年   83篇
  1973年   66篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Restriction fragment length polymorphism (RFLP) analysis for the purpose of individualization is now being used in casework in the People's Republic of China. This report describes the use of the multilocus minisatellite probe 33.15 to solve three cases, including two homicides and a rape. In the third case, fetal tissue was analyzed to prove that the alleged rapist was, in fact, the father. In each case, analysis of deoxyribonucleic acid (DNA) resulted in a positive match. The probability of chance association of the DNA fingerprint was calculated as 5.6 x 10(-12), which is similar to the figures reported in the literature.  相似文献   
12.
13.
14.
15.
16.
Production function estimates are provided for Soviet industrial production and gross national product for the period 1950–86. A variety of alternative specifications is tested, including Cobb-Douglas, constant elasticity of substitution and variable elasticity of substitution production functions, and an error correction mechanism is used to investigate the long-run properties of the estimated equation. The structural stability of the estimates is also examined. Constant-returns-to-scale Cobb-Douglas production functions suggest that the rate of total factor productivity growth in the Soviet economy has declined steadily over time, becoming negative sometime in the period between 1970 and 1980. However the extensive statistical tests can doubt on the validity of any production function estimated on Soviet data.  相似文献   
17.
The DNA commission of the International Society of Forensic Genetics (ISFG) was convened at the 21st congress of the International Society for Forensic Genetics held between 13 and 17 September in the Azores, Portugal. The purpose of the group was to agree on guidelines to encourage best practice that can be universally applied to assist with mixture interpretation. In addition the commission was tasked to provide guidance on low copy number (LCN) reporting. Our discussions have highlighted a significant need for continuing education and research into this area. We have attempted to present a consensus from experts but to be practical we do not claim to have conveyed a clear vision in every respect in this difficult subject. For this reason, we propose to allow a period of time for feedback and reflection by the scientific community. Then the DNA commission will meet again to consider further recommendations.  相似文献   
18.
19.
20.
This article examines constraints in development bureaucracies in intensifying the use of microcomputers as they move beyond processing applications to analysing applications. The work is based on the experience of several ministries of the Government of Kenya. Processing applications involve throughput of data and are relatively simple. Analysing applications, in contrast, are more complex and include data assembly, sensitivity analysis, and modelling. The article argues that processing applications are more compatible with the administrative cultures, bureaucratic functions, personnel skill levels and organizational structures of development bureaucracies. Analysing applications are less compatible because they require a level of training and motivation uncommon in development bureaucracies. Analysing applications are further thwarted by constraints in the supply of relevant information and the lack of demand for analysis by decision-makers. A four-cell matrix is developed which explains these constraints. The article concludes with several recommendations for encouraging microcomputer-based analysis, but cautions that processing applications will continue to dominate for the foreseeable future.  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