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   8284篇
  免费   219篇
各国政治   394篇
工人农民   358篇
世界政治   561篇
外交国际关系   268篇
法律   5173篇
中国政治   49篇
政治理论   1629篇
综合类   71篇
  2020年   76篇
  2019年   104篇
  2018年   230篇
  2017年   156篇
  2016年   232篇
  2015年   122篇
  2014年   121篇
  2013年   771篇
  2012年   276篇
  2011年   257篇
  2010年   165篇
  2009年   182篇
  2008年   180篇
  2007年   179篇
  2006年   195篇
  2005年   532篇
  2004年   250篇
  2003年   187篇
  2002年   159篇
  2001年   232篇
  2000年   182篇
  1999年   168篇
  1998年   99篇
  1997年   94篇
  1996年   75篇
  1995年   81篇
  1994年   73篇
  1993年   83篇
  1992年   136篇
  1991年   170篇
  1990年   153篇
  1989年   175篇
  1988年   154篇
  1987年   176篇
  1986年   169篇
  1985年   165篇
  1984年   146篇
  1983年   152篇
  1982年   104篇
  1981年   96篇
  1980年   92篇
  1979年   104篇
  1978年   85篇
  1976年   67篇
  1975年   75篇
  1974年   93篇
  1973年   82篇
  1972年   71篇
  1971年   62篇
  1969年   63篇
排序方式: 共有8503条查询结果,搜索用时 46 毫秒
991.
992.
993.
The necessity of rapid objective appraisal of the suspicion of intracorporeal drug smuggling (body-packing) by effective methods of investigation in the course of the first criminal investigation department measures raises the questions of suitable and admissible methods. The proportion of undetected crimes in intracorporeal narcotic smuggling must be rated as very high according to the data of the Federal Criminal Investigation Department. In the present paper, the suitability of various imaging techniques for drug detection are reported in terms of their risk, practicability and costs. For this purpose, the value of digital radiography, two-spectra radiography and X-ray computer tomography as compared to conventional X-ray investigations is examined in human experiments. A reality-oriented narcotics dummy (glucose pressed hard in preservative) was developed and administered to nine volunteers per os with a variable initial alimentary situation. Four radiograms were taken at fixed times up to 12 hours after administration with each imaging technique. The highest rate of detection was attained with computer tomography. In contrast to the other methods, more than 90% of the body packs could be identified here. Nevertheless, an application in criminal investigation practice cannot be recommended owing to various disadvantages. The recovery rate of the remaining methods is between 20% and 25%.  相似文献   
994.
Tooth fragments freshly extracted from humans and rats were stored at either 4 degrees C or room temperature in dry or humid conditions for periods ranging from 1 to 6 months. The fragments were reduced to powder and antigens were extracted. Comparison of these samples was carried out using Counter Current Electrophoresis. Extracted sera were tested against known specific antisera and resultant precipitin reactions stained for examination. Correct species identification was possible both from desiccated and humid fragments but there was species variation in the sensitivity of the method. All the extracts from human teeth were positive against human antisera. In the rat some test specimens were initially negative but became positive following further dilution of the extracts.  相似文献   
995.
Sudden and unexpected death and violent death of persons with a high risk of acquiring HIV-infections, especially homosexual males and intravenous drug abusers, have to be investigated by forensic autopsies. Therefore every forensic pathologist has to be aware of this infection and should try to make the proper diagnosis. Three typical cases are described: (1) suicide by hanging, (2) homicide by cutting the throat and (3) intravenous heroin overdose. Merely retrospectively it could be cleared up that the deceased were homosexual but did not manifestly suffer from AIDS. The morphological findings in the lymph nodes and the postmortem serological findings are described in detail.  相似文献   
996.
997.
998.
999.
The opinions expressed are those of the author and do not necessarily represent the official views of the National Juvenile Detention Association or the W.K. Kellogg Foundation.  相似文献   
1000.
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