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   13808篇
  免费   347篇
各国政治   602篇
工人农民   419篇
世界政治   922篇
外交国际关系   487篇
法律   8954篇
中国共产党   1篇
中国政治   64篇
政治理论   2580篇
综合类   126篇
  2020年   150篇
  2019年   185篇
  2018年   248篇
  2017年   285篇
  2016年   305篇
  2015年   215篇
  2014年   270篇
  2013年   1391篇
  2012年   357篇
  2011年   368篇
  2010年   301篇
  2009年   307篇
  2008年   361篇
  2007年   372篇
  2006年   377篇
  2005年   311篇
  2004年   321篇
  2003年   334篇
  2002年   310篇
  2001年   575篇
  2000年   533篇
  1999年   411篇
  1998年   162篇
  1997年   165篇
  1996年   150篇
  1995年   142篇
  1994年   159篇
  1993年   140篇
  1992年   285篇
  1991年   306篇
  1990年   279篇
  1989年   308篇
  1988年   270篇
  1987年   278篇
  1986年   281篇
  1985年   267篇
  1984年   231篇
  1983年   250篇
  1982年   164篇
  1981年   160篇
  1980年   124篇
  1979年   198篇
  1978年   130篇
  1977年   122篇
  1976年   107篇
  1975年   109篇
  1974年   131篇
  1973年   124篇
  1972年   103篇
  1971年   101篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
A method has been developed on reverse phase high performance liquid chromatography for simultaneous determination of methyl, ethyl and isopropyl alcohols under refractive index detection using pure water as the mobile phase. A good separation has been achieved between these alcohols. Detector response was linear with a detection limit of 5 mg/100 ml. Recovery studies were performed by adding known amounts of methyl and ethyl alcohols to blood, lung and liver within the range 80–90%. The reproducibility of the results was always >90%. The quantitative distribution of methyl alcohol in postmortem body tissues and fluids has been reported in three cases of poisoning.  相似文献   
14.
This article examines the use of Eye Movement Desensitization and Reprocessing (EMDR) in helping a client address problems with persistent anxiety and a lack of self-esteem. During EMDR treatment, the client explored the dichotomous thinking that had plagued her since childhood, and correspondingly, the role of childhood physical and emotional abuse in her chronic feelings of inadequacy and anxiety. The client experienced significant improvement in her levels of anxiety and problems with self-esteem, both at the end of treatment and at 1-year follow up. Qualitative and quantitative data are utilized in this case study outlining the use of EMDR with a client diagnosed with dysthymic disorder.  相似文献   
15.
This review chronicles the characteristics of deliberate and accidental mass poisonings that occurred in World Wars I and II, in Bhopal, and in other historical cases up to and including modern wars. It also considers approaches to the investigation of such cases from the medicolegal as well as general standpoints.  相似文献   
16.
The concern driving current debate on agricultural extension is increasingly that of how to help farmers learn how to deal with the complex world around them responsibly and profitably, in such a way that the extension worker is ancillary. This article seeks to deconstruct and provide a more reasoned assessment of agricultural extension services through a reflection on development paradigms, adult education, individual empowerment, and institutional pluralism. By calling into question the underlying ethical dimensions of agricultural extension, it is possible to develop an alternative paradigm and thereby generate new insights into it. The article concludes that the raison d'être of agricultural extension today must be to create an ethical basis which ensures that extension practices are more inclusive and thus responsive to the needs of farmers and other rural populations, integrating individual expectations into the wider socio-economic, cultural, political, and geographical environment.  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.
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