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   26955篇
  免费   534篇
各国政治   1009篇
工人农民   1652篇
世界政治   1725篇
外交国际关系   912篇
法律   16252篇
中国共产党   2篇
中国政治   96篇
政治理论   5656篇
综合类   185篇
  2020年   237篇
  2019年   265篇
  2018年   1548篇
  2017年   1526篇
  2016年   1402篇
  2015年   363篇
  2014年   379篇
  2013年   1831篇
  2012年   628篇
  2011年   1338篇
  2010年   1310篇
  2009年   940篇
  2008年   1179篇
  2007年   1163篇
  2006年   508篇
  2005年   508篇
  2004年   625篇
  2003年   613篇
  2002年   463篇
  2001年   802篇
  2000年   726篇
  1999年   569篇
  1998年   313篇
  1997年   267篇
  1996年   234篇
  1995年   243篇
  1994年   285篇
  1993年   236篇
  1992年   392篇
  1991年   423篇
  1990年   384篇
  1989年   414篇
  1988年   392篇
  1987年   403篇
  1986年   406篇
  1985年   385篇
  1984年   324篇
  1983年   356篇
  1982年   276篇
  1981年   265篇
  1980年   194篇
  1979年   273篇
  1978年   186篇
  1977年   177篇
  1976年   145篇
  1975年   148篇
  1974年   161篇
  1973年   145篇
  1972年   137篇
  1971年   115篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
The conflict and animosity that sometimes accompanies child custody disputes can give rise to the propagation of allegations of child sexual abuse. To characterize the magnitude of the problem, the present study attempted to determine whether and to what extent child sexual abuse allegations predominate in family court litigation. The entire one-year caseload of a county family court docket was systematically reviewed and coded. Methodical evaluation of 603 family court files yielded base rates of pertinent allegations and other information profiling the cases. The findings did not support the contention that sexual abuse allegations are commonplace in child custody disputes. Sexual abuse allegations were made in 2% of cases in which custody or access was contested and in only 0.8% of the cases overal. Implications of the findings for future research were discussed.The authors gratefully acknowledge the assistance of the Honorable William R. Campbell and Barbara Scott, Clerk of Court for the South Carolina Fifth Judicial Circuit, as well as the contributions of Angie Newton, Frank Robinson, and Kimberly Ellis in the data collection process.  相似文献   
153.
Federal transportation officials assert that labor protections in the Urban Mass Transportation Act inhibit the propensity of local transit agencies to contract with private firms for services. The authors present results from a survey of a large sample of transit managers and econometric analysis to support their conclusion that labor protections do not appear to reduce the incidence of contracting. The labor protections, however, may be costly to transit management in other ways. The authors recommend actions, aside from repeal of labor protections, to increase contracting by local transit agencies.  相似文献   
154.
155.
156.
157.
158.
Some features of early child care are more prominent in Norway than in other countries, such as emphasis on the outdoor environment. Of general relevance and interest is the form of day care provided by forest day-care centers. Three ideas form the development of these centers placed in wild areas. First, throughout history, Norwegians have had a close attachment to nature and some parents want to provide their children with outdoor experiences at an early age. Second, urging children to play outdoors characterizes the image many parents have of a happy, healthy childhood. Third, provision of day care for children has always been restricted in western countries, forcing parents to invent types of service that can become part of an ecological system that promotes healthy development.The forest day-care centers developed recently represent a supplement to the wide typology of child care in the 21st century. The article outlines the connections between these ideas in general European and western history and Norwegian history and presents debate and decisions about a question dating from the last half of the 1980s. It concludes that the forest day-care centers are perhaps only a modern form of the original kindergarten concept, which started in Europe and America as gardens for children not gardens of children.  相似文献   
159.
Ethanol was determined by gas chromatography in a variety of tissues and body fluids secured at autopsy in 61 cases. The specimens tested included right and left heart blood, femoral blood, pericardial fluid, cerebrospinal fluid, vitreous humor, urine, stomach contents, and brain. Statistical analysis of the cases revealed no significant differences among the various blood sites tested. However, the variations in blood ethanol concentrations among the various sampling sites within each case were as follows: 40 cases showed differences of less than 25%; 16 cases revealed variability between 25% and 50%, 4 cases had differences exceeding 50%. In one case, satisfactory blood analyses could not be accomplished. The larger variances occurred especially in those instances in which stomach alcohol concentration was 0.50% or greater. In one case, the variability amongst the different blood sites exceeded 400% (femoral blood--0.043%, right atrium--0.070%, root of aorta--0.156%); the brain was 0.050%, and the stomach contents was 1.2%. For all 61 cases, variances in blood alcohol content among the different sampling sites in a single cadaver ranged from 1.8 to 428%.  相似文献   
160.
Using an interrupted time-series design, this research note analyzes the long-term effect of Minnesota's sentencing guidelines on reducing unwarranted disparity in sentencing outcomes that fall within their scope of authority. Unwarranted disparity is defined as residual variation not attributable to legally mandated sentencing factors. Findings suggest that although the sentencing guidelines initially reduced disparity for the no prison/prison sentencing decision, inequality began to revert to preguideline levels as time passed. Further analysis revealed that the guidelines had a permanent impact on reducing disparities in decisions on the length of prison sentence. Overall we observed an 18% decline in disparity for the no prison/prison outcome and a 60% reduction in inequality for the judicial decision as to length of prison sentence. Two explanations for the reversionary trend in the no prison/prison series are highlighted.  相似文献   
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