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   77615篇
  免费   3049篇
各国政治   4651篇
工人农民   3130篇
世界政治   6570篇
外交国际关系   4000篇
法律   39183篇
中国共产党   14篇
中国政治   804篇
政治理论   21367篇
综合类   945篇
  2021年   449篇
  2020年   1216篇
  2019年   1577篇
  2018年   1859篇
  2017年   2135篇
  2016年   2331篇
  2015年   1888篇
  2014年   2157篇
  2013年   10776篇
  2012年   1873篇
  2011年   2048篇
  2010年   1984篇
  2009年   2201篇
  2008年   2008篇
  2007年   2037篇
  2006年   2189篇
  2005年   2045篇
  2004年   1926篇
  2003年   1734篇
  2002年   1770篇
  2001年   2168篇
  2000年   1896篇
  1999年   1645篇
  1998年   1231篇
  1997年   1053篇
  1996年   1053篇
  1995年   1000篇
  1994年   1016篇
  1993年   1018篇
  1992年   1197篇
  1991年   1219篇
  1990年   1159篇
  1989年   1177篇
  1988年   1181篇
  1987年   1181篇
  1986年   1214篇
  1985年   1233篇
  1984年   1100篇
  1983年   1126篇
  1982年   977篇
  1981年   905篇
  1980年   720篇
  1979年   821篇
  1978年   661篇
  1977年   584篇
  1976年   528篇
  1975年   468篇
  1974年   491篇
  1973年   485篇
  1972年   412篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
942.
943.
In the summer of 1984, police in Pinellas County, Florida, confiscated six identically colored imported Asian skulls (in a shipping case) from a private citizen. In May 1988, in nearby Hillsborough County, police confiscated a very similar skull from another private citizen, who allegedly had found it in an abandoned house. Aside from slight color differences between the six found in Pinellas County and the one found in Hillsborough County, the skulls are virtually identical in their osteological characteristics and condition and in the vital statistics derived from each. Each skull is as clean and dry as those typically sold by commercial scientific supply outlets in the United States. Each is edentulous (primarily premortem), between approximately 20 and 60 years of age at death, and morphologically Asian. Five of the seven are morphologically male, one is morphologically female, and one is a mosaic with respect to gender-related features. Police, medical examiners, coroners, and forensic anthropologists should be aware of such "souvenir" specimens, in the event that they encounter similar skulls. Discriminant function analyses for race and sex yield considerably conflicting results, which underscores the need for using extreme caution when interpreting forensic science estimates based on such techniques.  相似文献   
944.
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   
945.
946.
947.
948.
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   
949.
950.
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