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   70334篇
  免费   3337篇
各国政治   4634篇
工人农民   2948篇
世界政治   6152篇
外交国际关系   4005篇
法律   32999篇
中国共产党   45篇
中国政治   811篇
政治理论   21036篇
综合类   1041篇
  2021年   427篇
  2020年   1195篇
  2019年   1553篇
  2018年   1751篇
  2017年   2050篇
  2016年   2253篇
  2015年   1876篇
  2014年   2146篇
  2013年   10819篇
  2012年   1665篇
  2011年   1802篇
  2010年   1886篇
  2009年   2154篇
  2008年   1867篇
  2007年   1845篇
  2006年   2000篇
  2005年   1882篇
  2004年   1749篇
  2003年   1535篇
  2002年   1597篇
  2001年   1552篇
  2000年   1378篇
  1999年   1224篇
  1998年   1136篇
  1997年   1007篇
  1996年   973篇
  1995年   932篇
  1994年   941篇
  1993年   960篇
  1992年   971篇
  1991年   1031篇
  1990年   951篇
  1989年   1000篇
  1988年   1001篇
  1987年   1004篇
  1986年   981篇
  1985年   1044篇
  1984年   941篇
  1983年   992篇
  1982年   887篇
  1981年   865篇
  1980年   664篇
  1979年   687篇
  1978年   597篇
  1977年   538篇
  1976年   493篇
  1975年   404篇
  1974年   421篇
  1973年   435篇
  1972年   364篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
781.
Eighteen external quality assessment (proficiency testing) samples were prepared from client specimens collected with the Intercept® oral fluid collection device and by spiking drug-free oral fluid. Samples were circulated in pairs at quarterly intervals to 13 UK and USA based laboratories for analysis by a panel of OraSure micro-plate Intercept® enzyme immunoassay kits and hyphenated mass spectrophotometric techniques. During the survey, there was a single case of non-specificity in a false report for methadone. The major errors were of lack of sensitivity relative to the concentration thresholds specified for the immunoassays. The sensitivity for overall ‘present’/‘not found’ reports calculated as true positives/(true positives + false negatives) were for the amfetamine specific assay 50%, methyl-amfetamines 93%, barbiturates 64%, cannabinoids 73%, cocaine and metabolites 100%, benzodiazepines 69%, methadone 95%, opiates 79% (opiates excluding oxycodone 93%), phencyclidine 93% and human gamma-globulin 97%. A small number of the sensitivity errors were attributable to errors in chromatographic confirmation techniques.  相似文献   
782.
783.
784.
Two conditions must be met in order for a person to be rightly considered the victim of a crime. First, there must be the victim of some form of harm. Second, the harm in question was the direct result of an act in which the harmed individual did not knowingly consent to take part. What are the dynamics of consent and how important should consent be in defining and placing criminal responsibility in crimes where women are sexually victimized? Finally, how does the conceptualization of victimization change when viewed from liberal and radical feminist perspectives?  相似文献   
785.
786.
787.
788.
789.
790.
How realistic are democratic-governance strategies that emphasize local governance as a key component? Using Nigeria’s experience in local government and primary health care in the 1980s and 1990s as a case example, the article finds there were substantial shortfalls in local participation and program performance. These were caused by problems in the local political environment and local institutional design, in the national policy environment (particularly in the funding system), and by the stresses of structural adjustment, resource shortfalls, the natural physical environment, and weak leadership. These combined to create poor and inappropriate reward structures and lack of accountability. However, even though the Nigerian case was not successful, most of the specific problems that hurt it are remediable through policy changes at the national level. Several of these were under consideration at the time of the coups of 1992 and 1993.  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