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   17562篇
  免费   809篇
各国政治   715篇
工人农民   630篇
世界政治   1409篇
外交国际关系   575篇
法律   11620篇
中国共产党   1篇
中国政治   95篇
政治理论   3250篇
综合类   76篇
  2021年   114篇
  2020年   298篇
  2019年   360篇
  2018年   408篇
  2017年   494篇
  2016年   486篇
  2015年   364篇
  2014年   444篇
  2013年   1744篇
  2012年   424篇
  2011年   493篇
  2010年   442篇
  2009年   450篇
  2008年   463篇
  2007年   467篇
  2006年   489篇
  2005年   421篇
  2004年   432篇
  2003年   423篇
  2002年   389篇
  2001年   720篇
  2000年   681篇
  1999年   487篇
  1998年   265篇
  1997年   214篇
  1996年   194篇
  1995年   186篇
  1994年   225篇
  1993年   193篇
  1992年   323篇
  1991年   358篇
  1990年   331篇
  1989年   355篇
  1988年   332篇
  1987年   325篇
  1986年   353篇
  1985年   352篇
  1984年   271篇
  1983年   291篇
  1982年   198篇
  1981年   194篇
  1980年   149篇
  1979年   216篇
  1978年   144篇
  1977年   135篇
  1976年   125篇
  1974年   124篇
  1973年   128篇
  1972年   100篇
  1971年   92篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
61.
62.
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   
63.
64.
This article examines voluntary mediation and provides suggested criteria for attorneys in deciding whether or not to use mediation. The author discusses what mediation has to offer, what it takes to make it work, and important cautions for attorneys in deciding about the use of this process.  相似文献   
65.
In motorcycle accidents involving two riders, medicolegal identification of the driver is necessary when one or both riders die. It is particularly important in the latter case, because the survivor almost always insists that he or she was not driving. One characteristic injury that distinguishes the driver from the passenger is inguinal contusion-laceration (accompanied internally by pelvic fracture). This injury, caused by collision of the pelvis with the fuel tank, identifies the driver.  相似文献   
66.
67.
Kindergarten policy varies widely both across and within states. Over the past decade, a number of states have instituted a full‐day kindergarten requirement and others are considering it as a way to increase educational achievement. Many parents also support full‐day kindergarten as a source of child care. This paper uses the Early Child Longitudinal Study–Kindergarten Class of 1998–1999 to evaluate the efficacy of this policy. In ordinary least squares, probit, county fixed effects, and instrumental variables models, we find that there are initial benefits for students and the mothers of students who attend full‐day kindergarten, but that these differences largely evaporate by third grade. Contrary to claims by some advocates, attending full‐day kindergarten is found to have no additional benefit for students in families with income below the poverty threshold. © 2006 by the Association for Public Policy Analysis and Management  相似文献   
68.
69.
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   
70.
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