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   13232篇
  免费   174篇
各国政治   367篇
工人农民   1284篇
世界政治   531篇
外交国际关系   477篇
法律   7979篇
中国政治   35篇
政治理论   2708篇
综合类   25篇
  2023年   42篇
  2021年   29篇
  2020年   72篇
  2019年   90篇
  2018年   1380篇
  2017年   1297篇
  2016年   1132篇
  2015年   140篇
  2014年   126篇
  2013年   493篇
  2012年   313篇
  2011年   1040篇
  2010年   1098篇
  2009年   707篇
  2008年   858篇
  2007年   826篇
  2006年   144篇
  2005年   167篇
  2004年   285篇
  2003年   266篇
  2002年   123篇
  2001年   215篇
  2000年   215篇
  1999年   157篇
  1998年   74篇
  1997年   75篇
  1996年   75篇
  1995年   81篇
  1994年   84篇
  1993年   56篇
  1992年   124篇
  1991年   111篇
  1990年   133篇
  1989年   122篇
  1988年   137篇
  1987年   129篇
  1986年   100篇
  1985年   108篇
  1984年   90篇
  1983年   80篇
  1982年   57篇
  1981年   47篇
  1980年   42篇
  1979年   57篇
  1978年   43篇
  1977年   30篇
  1976年   30篇
  1975年   28篇
  1974年   39篇
  1973年   28篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
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   
63.
64.
65.
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   
66.
67.
68.
69.
In the wake of the 1990 amendments to the Clean Air Act, localities across the United States initiated public information campaigns both to raise awareness of threats to air quality and to change behavior related to air pollution by recommending specific behavioral changes in the campaign messages. These campaigns are designed to reduce the health hazards associated with poor air quality and to avoid federal sanctions resulting from the failure to meet air quality standards. As in many other communities across the country, a coalition of government agencies and businesses initiated a public information campaign in the Atlanta metropolitan region to reduce certain targeted behaviors, mainly driving. A two‐stage model used to analyze data from a rolling sample survey shows that the centerpiece of the information campaign—air quality alerts—was effective in raising awareness and reducing driving in a segment of the population. When the overall information campaign was moderated by employers' participation in programs to improve air quality, drivers significantly reduced the number of miles they drove and the number of trips they took by car on days when air quality alerts were sounded. Public information campaigns can be successful in increasing awareness, but changing well‐established behaviors, such as driving, is likely to require institutional mediation to provide social contexts that support the behavioral change, as well. © 2003 by the Association for Public Policy Analysis and Management.  相似文献   
70.
On the one hand the following case demonstrates the problems of finding a dead body in the bathroom and on the other hand the importance of postmortem x-ray examinations. The corpse of an 65-year-old woman was discovered in her bath tub. At the body's feet there was a hair dryer. Investigations concerning murder were negative, circumstances appeared to be unsuspicious. That was why a postmortem examination was not performed. -4 years later murder had to be considered. After manual strangling the deceased and the hair dryer were layed into the bath tub. The corpse was exhumed and taken to a forensic autopsy. It was found that the hyoid bone and the superior horn of the thyroid cartilage were both fractured on the right. Damages caused by the preparation itself were excluded by using serial roentgenographs. These observations in combination with histological findings and the results of further investigations convincingly supported the suspicion of strangling by hand.  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