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   13392篇
  免费   404篇
各国政治   560篇
工人农民   442篇
世界政治   986篇
外交国际关系   451篇
法律   8497篇
中国政治   82篇
政治理论   2677篇
综合类   101篇
  2020年   160篇
  2019年   201篇
  2018年   265篇
  2017年   285篇
  2016年   290篇
  2015年   208篇
  2014年   259篇
  2013年   1331篇
  2012年   303篇
  2011年   338篇
  2010年   298篇
  2009年   300篇
  2008年   333篇
  2007年   363篇
  2006年   386篇
  2005年   317篇
  2004年   314篇
  2003年   338篇
  2002年   308篇
  2001年   501篇
  2000年   443篇
  1999年   364篇
  1998年   179篇
  1997年   153篇
  1996年   141篇
  1995年   139篇
  1994年   146篇
  1993年   143篇
  1992年   246篇
  1991年   289篇
  1990年   260篇
  1989年   285篇
  1988年   257篇
  1987年   294篇
  1986年   269篇
  1985年   291篇
  1984年   246篇
  1983年   270篇
  1982年   189篇
  1981年   179篇
  1980年   150篇
  1979年   178篇
  1978年   146篇
  1977年   120篇
  1976年   118篇
  1975年   106篇
  1974年   121篇
  1973年   120篇
  1972年   93篇
  1971年   89篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Correlation between plasma and bone marrow tricyclic antidepressants has not been studied before. Two groups of rabbits were given 10 and 20 mg of desipramine/kg body weight, respectively. Desipramine was administered to the animals once daily by mouth for 5 days. On the fifth day the animals were sacrificed and blood and bone marrow samples were collected and analyzed using a high performance liquid chromatographic (HPLC) method. Data showed that a correlation exists between bone marrow and blood desipramine. The bone marrow desipramine concentration increased as its blood levels increased. The average ratio of bone marrow to blood desipramine +/- S.D. (standard deviation) in both dosage groups was 37.2 +/- 4.46 with a range of 30.99-44.82. This investigation is promising and shows that bone marrow could be used as an alternative tissue in the absence of a suitable blood sample.  相似文献   
53.
54.
The Green River Murder Investigation in King County, Washington, is currently the longest active serial murder investigation in U.S. history. During its course, over 26 separate scenes with from one to five victims each have been processed. The experience of the authors is presented in order to acquaint other agencies with techniques of outdoor scene processing that have evolved during recovery of remains from Green River and other skeletal cases.  相似文献   
55.
The population-adjusted rate of teenage suicide in King County, Washington, was reviewed for the 26 years from 1959 to 1984. For the entire period, the rate did not change significantly. An abrupt change did occur during the middle of this period, but, for reasons discussed in the text, this may well represent a change in procedures and philosophy of death certification rather than a real change in rate. Reasons for the apparent discrepancy with national statistics are discussed.  相似文献   
56.
This study probes the interconnections among distrust of government, the historical context, and public support for the death penalty in the United States with survey data for area-identified samples of white and black respondents. Multilevel statistical analyses indicate contrary effects of government distrust on support for the death penalty for blacks and whites, fostering death penalty support among whites and diminishing it among blacks. In addition, we find that the presence of a "vigilante tradition," as indicated by a history of lynching, promotes death penalty support among whites but not blacks. Finally, contrary to Zimring's argument in The Contradictions of Capital Punishment , we find no evidence that vigilantism moderates the influence of government distrust on support for the death penalty, for either whites or blacks. Our analyses highlight the continuing influence of historical context as well as contemporary conditions in the formation of public attitudes toward criminal punishment, and they underscore the importance of attending to racial differences in the analysis of punitive attitudes.  相似文献   
57.
58.
In the statistical interpretation of forensic glass evidence it is standard practice to make the assumption of homogeneity of the refractive index (RI) of the source glass, or of localized homogeneity. However, the work of Locke and Hayes showed that, for toughened windscreen glass, this assumption might not be true. This work is well cited, but there appears to have been little follow-on published research. Furthermore, the toughening process is something known to affect the refractive index, and is a process that float glass does not undergo. Float glass is a major component of casework in New Zealand and for that reason it would be interesting to know whether the findings of Locke and Hayes apply when dealing with float glass. In this paper we describe an experiment similar to that of Locke and Hayes, systematically examining the variation of RI in a pane of float window glass. It was found that, although there were no systematic differences in refractive index, there were observable differences across the pane.  相似文献   
59.
60.
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