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   10803篇
  免费   343篇
各国政治   371篇
工人农民   487篇
世界政治   681篇
外交国际关系   318篇
法律   6813篇
中国共产党   34篇
中国政治   141篇
政治理论   2165篇
综合类   136篇
  2021年   64篇
  2020年   151篇
  2019年   134篇
  2018年   209篇
  2017年   253篇
  2016年   283篇
  2015年   231篇
  2014年   242篇
  2013年   870篇
  2012年   268篇
  2011年   304篇
  2010年   239篇
  2009年   307篇
  2008年   362篇
  2007年   368篇
  2006年   351篇
  2005年   329篇
  2004年   310篇
  2003年   254篇
  2002年   243篇
  2001年   355篇
  2000年   332篇
  1999年   264篇
  1998年   163篇
  1997年   121篇
  1996年   150篇
  1995年   129篇
  1994年   143篇
  1993年   140篇
  1992年   210篇
  1991年   267篇
  1990年   223篇
  1989年   212篇
  1988年   232篇
  1987年   216篇
  1986年   230篇
  1985年   199篇
  1984年   175篇
  1983年   167篇
  1982年   112篇
  1981年   130篇
  1980年   113篇
  1979年   114篇
  1978年   99篇
  1977年   86篇
  1976年   71篇
  1975年   72篇
  1974年   70篇
  1973年   82篇
  1971年   53篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
We present an accidental autoerotic asphyxiation of a 24-year-old man. Further investigation revealed that 18 years earlier, his brother, then 13, had been found dead, hanging in the family bathroom. Although that death had been ruled a suicide, reevaluation of the death scene indicates that this was also an autoerotic asphyxiation. This is the first reported case of sexual asphyxia involving siblings.  相似文献   
902.
903.
The distribution of plasminogen phenotypes in the population of Veneto was investigated by ultrathin-layer isoelectric focusing. In our sample (n = 1325), the three common phenotypes PLG1, PLG2, PLG2-1 and two further phenotypes PLG1-V and PLG2-V were, observed and the following frequencies calculated: PLG1 = 0.84038; PLG2 = 0.15811; PLGV = 0.00151. These gene frequencies are compared to those found in other populations. Analysis of 41 mother-child pairs was in agreement with an autosomal codominant inheritance.  相似文献   
904.
905.
906.
This paper examines (1) the relationship between drug involvement among inner-city youths and the commission of other kinds of crime, (2) the role of drug use in crime commission, (3) the connection between crime and drug procurement, and (4) the factors that distinguish between individuals as a function of (a) levels of involvement in drug trafficking and (b) drug usage and criminal activity. Drug use and trafficking were both related to other criminal activities; the type of drug involvement was related to the type of crimes reported. The heaviest users were significantly more likely than nonusers to commit property crimes and drug traffickers were significantly more likely to commit crimes against persons than were respondents who did not sell drugs. Adolescents who used and sold drugs were the most likely to commit crimes against persons and property, and at the greatest rate. Still, for every type of crime reported in the past year, only a minority of offenders reported ever using drugs while committing the crime or said that they committed any type of crime in order to obtain drugs or money to obtain drugs. Most youths appear to commit crime for reasons completely independent of drugs.  相似文献   
907.
908.
Fifty-six cases of paraquat poisoning were examined during the 8 years 1977-1984. The ratio of cases of accidental to intentional ingestion of the poison was 1:1; 23.2% of the total (13/56) survived several months or years. In 1983, 11 subjects accidentally drank 10-30 ml of gramoxone; eight of 11 died in 2 weeks. Toxicological investigations demonstrated rapid elimination of poison from the blood, as well as prolonged fixation of paraquat in the lung, kidney, liver, and spleen tissues. Histological examinations showed multiorgan failure from renal tubular necrosis and pulmonary hemorrhage with alveolar epithelial injury. Pulmonary proliferative changes were present in only two cases who survived 7 and 10 days and in which artificial ventilation was utilized.  相似文献   
909.
910.
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