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   10511篇
  免费   628篇
各国政治   543篇
工人农民   321篇
世界政治   808篇
外交国际关系   487篇
法律   6363篇
中国共产党   2篇
中国政治   71篇
政治理论   2468篇
综合类   76篇
  2021年   62篇
  2020年   199篇
  2019年   229篇
  2018年   277篇
  2017年   319篇
  2016年   321篇
  2015年   266篇
  2014年   265篇
  2013年   1315篇
  2012年   224篇
  2011年   272篇
  2010年   297篇
  2009年   323篇
  2008年   262篇
  2007年   256篇
  2006年   271篇
  2005年   267篇
  2004年   276篇
  2003年   251篇
  2002年   248篇
  2001年   381篇
  2000年   327篇
  1999年   289篇
  1998年   157篇
  1997年   123篇
  1996年   106篇
  1995年   125篇
  1994年   139篇
  1993年   133篇
  1992年   188篇
  1991年   207篇
  1990年   179篇
  1989年   203篇
  1988年   150篇
  1987年   171篇
  1986年   161篇
  1985年   170篇
  1984年   130篇
  1983年   157篇
  1982年   121篇
  1981年   126篇
  1980年   89篇
  1979年   146篇
  1978年   101篇
  1977年   77篇
  1976年   80篇
  1975年   64篇
  1974年   73篇
  1973年   74篇
  1972年   56篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
11.
The lungs of 79 children who had died between the ages of 1 week and 2 years old were histologically examined. 59 of these children could be categorized as cases of Sudden Infant Death because of the history and postmortem findings. In the remaining 20 cases a definite cause of death could be established. This is the same collective on which the histological investigations of the lymphatic tissue has been carried out. Morphological changes which are typical for a virus pneumonia were found in a substantially higher frequency in the cases of Sudden Infant Death than in the control cases. The validity of these findings and their possible significance for the cause of death are discussed.  相似文献   
12.
13.
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   
14.
15.
16.
17.
18.
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   
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