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   73012篇
  免费   3295篇
各国政治   4533篇
工人农民   3019篇
世界政治   6235篇
外交国际关系   3867篇
法律   35983篇
中国共产党   11篇
中国政治   756篇
政治理论   20962篇
综合类   941篇
  2021年   414篇
  2020年   1178篇
  2019年   1533篇
  2018年   1752篇
  2017年   2045篇
  2016年   2246篇
  2015年   1855篇
  2014年   2112篇
  2013年   10558篇
  2012年   1753篇
  2011年   1872篇
  2010年   1896篇
  2009年   2117篇
  2008年   1888篇
  2007年   1878篇
  2006年   2063篇
  2005年   1930篇
  2004年   1820篇
  2003年   1592篇
  2002年   1677篇
  2001年   1937篇
  2000年   1651篇
  1999年   1438篇
  1998年   1154篇
  1997年   1009篇
  1996年   999篇
  1995年   976篇
  1994年   978篇
  1993年   1011篇
  1992年   1101篇
  1991年   1116篇
  1990年   1070篇
  1989年   1076篇
  1988年   1096篇
  1987年   1082篇
  1986年   1137篇
  1985年   1180篇
  1984年   1038篇
  1983年   1054篇
  1982年   912篇
  1981年   859篇
  1980年   677篇
  1979年   764篇
  1978年   612篇
  1977年   548篇
  1976年   498篇
  1975年   441篇
  1974年   479篇
  1973年   454篇
  1972年   399篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
This study investigated the impact of the abolition of the tender years doctrine on custody decisions in divorce cases. This doctrine supported the presumption that the mother is the more suitable parent for young children. In March of 1981, the Supreme Court of the State of Alabama found this doctrine to be unconstitutional. To assess the hypothesis that this ruling had a significant effect on custodyrelated decisions, a sample of court records for divorce cases in an Alabama county was examined as representative of the state on a number of key variables. Overall, no significant differences were found on indicator variables for the comparisons before and after the ruling. There was neither an increase in custody grants to fathers nor an increase in custody requests by fathers.  相似文献   
972.
973.
Some psychiatrists misuse theoretical concepts beyond their generally accepted dimensions in an attempt to support a conclusion favorable to a litigant or defendant. In the case presented, the concept of identification with the aggressor was used in an attempt to eliminate or minimize the effect of a confession and to buttress the claim that the confession itself was false. Quotations from the actual reports and testimony are used to reflect both this tactic and the context in which these issues were pursued, including a rather startling admission by the psychiatrist dealing with the thoroughness of his professional effort. A brief history of "identification with the aggressor" is presented, a history which contrasts with its application to rather routine police questioning. Similarly, skepticism is clearly merited when a psychitrist testifies as to truthfulness or falsity of a statement.  相似文献   
974.
975.
The authors developed a method of malathion insecticide determination in the cadaveric material (blood and wall of the stomach) including extraction of 5 ml of blood (5 g of fragmented tissue of stomach wall) by hexan; preparative chromatographic purification of extract on silicagel layer L 5/40 mkm in hexan-diethyl ether system 10:2; Gas-liquid chromatographic investigation on column with 5% SE-30 and 5% XE-60 (Chromatograph "Colour-106" with thermionic detector). This method makes it possible to detect 72-76% of malathion added.  相似文献   
976.
977.
978.
979.
The authors reviewed at autopsy the causes of death of 274 patients with evidence of intravenous drug abuse who had been admitted to a large public hospital. There were 127 who died from diseases unrelated to intravenous drug abuse, and in 41% of these, chronic alcoholism was implicated. Deaths from overdose syndromes and drug-related organ pathology comprised only 11% of all cases. The mean age at death was 39 years. There was a male/female ratio of 3.6:1. Half of all patients died from infection--72 from acquired immunodeficiency syndrome (AIDS) alone. These findings indicate that persons hospitalized with a history of intravenous drug abuse usually die from causes other than overdose and that AIDS and chronic alcoholism are significant problems. Emphasis should be placed upon detecting "hidden" intravenous drug deaths to provide more accurate statistical information.  相似文献   
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