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   10561篇
  免费   590篇
各国政治   457篇
工人农民   334篇
世界政治   688篇
外交国际关系   346篇
法律   7393篇
中国政治   69篇
政治理论   1816篇
综合类   48篇
  2020年   202篇
  2019年   212篇
  2018年   247篇
  2017年   293篇
  2016年   281篇
  2015年   258篇
  2014年   245篇
  2013年   999篇
  2012年   230篇
  2011年   268篇
  2010年   274篇
  2009年   299篇
  2008年   259篇
  2007年   232篇
  2006年   263篇
  2005年   243篇
  2004年   266篇
  2003年   243篇
  2002年   223篇
  2001年   473篇
  2000年   365篇
  1999年   316篇
  1998年   132篇
  1997年   110篇
  1996年   103篇
  1995年   127篇
  1994年   127篇
  1993年   139篇
  1992年   229篇
  1991年   235篇
  1990年   219篇
  1989年   215篇
  1988年   200篇
  1987年   215篇
  1986年   218篇
  1985年   234篇
  1984年   183篇
  1983年   190篇
  1982年   116篇
  1981年   112篇
  1980年   75篇
  1979年   140篇
  1978年   99篇
  1977年   80篇
  1976年   67篇
  1975年   74篇
  1974年   94篇
  1973年   78篇
  1972年   70篇
  1968年   67篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Eleven incidents of carbon monoxide (CO) intoxication resulting in sixteen fatalities are reported. All of the cases involved heating systems as either the source or the means of distributing the CO. Blood samples were analyzed for ethanol and CO. Elevated blood CO saturations were found in 14 of the 16 victims while none of the victims had a blood ethanol concentration greater than 0.10% (w/v).  相似文献   
972.
This essay places George W. Bush's presidency and the Bush administration in some historical context by applying the model of "political time" developed in recent books by Stephen Skowronek (2008 ) and Keith Whittington (2007 ). My thesis is that Bush's political failure during his second term was largely the result of structural tensions created by the attacks of September 11, 2001, that no leader could have overcome. This argument is an extension of Skowronek's and Whittington's views that the executive branch's relationship to other governing institutions is shaped primarily by the president's relative position in the party system. In essence, 9/11 undermined the coalition forged by Ronald Reagan by pushing President George W. Bush to pursue radical change. These actions could not be squared with his need, as the leader of the majority party, to maintain electoral stability. A presidency divided against itself in this way cannot, and did not, stand.  相似文献   
973.
Abstract: The frequency and characteristics of suicide by cop cases (SBC) among a large (n = 707) nonrandom sample of North American officer-involved shootings (OIS) were investigated. “Suicide by cop” is when a subject engages in behavior which poses an apparent risk of serious injury or death, with the intent to precipitate the use of deadly force by law enforcement against the subject. Thirty-six percent of the OIS in this sample were found to be SBC with high interrater agreement (intraclass correlation coefficient = 0.93) for category classification. SBC cases were more likely to result in the death or injury of the subjects than regular OIS cases. Most SBC cases were spontaneous, but had clear verbal and behavioral indicators that occurred prior to, and during the event. Findings confirm the trend detected in earlier research that there was a growing incidence of SBC among OIS. SBC individuals had a high likelihood of possessing a weapon (80%), which was a firearm 60% of the time. Half of those with a firearm discharged it at the police during the encounter. Nineteen percent simulated weapon possession to accomplish their suicidal intent. Other findings highlight the histories and commonalities in this high risk group.  相似文献   
974.
975.
976.
977.
Group specific phenotypes in dried bloodstains can be rapidly and reliably determined by immunofixation on cellulose acetate membranes. Up to 16 samples, can be analyzed simultaneously in less than 60 min, and the cellulose acetate electrophoretogram is retained as a permanent record.  相似文献   
978.
979.
980.
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