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   2774篇
  免费   92篇
各国政治   173篇
工人农民   97篇
世界政治   231篇
外交国际关系   183篇
法律   1206篇
中国政治   39篇
政治理论   887篇
综合类   50篇
  2023年   19篇
  2022年   13篇
  2021年   27篇
  2020年   35篇
  2019年   69篇
  2018年   83篇
  2017年   89篇
  2016年   89篇
  2015年   74篇
  2014年   107篇
  2013年   393篇
  2012年   102篇
  2011年   76篇
  2010年   75篇
  2009年   86篇
  2008年   85篇
  2007年   104篇
  2006年   92篇
  2005年   78篇
  2004年   87篇
  2003年   85篇
  2002年   80篇
  2001年   53篇
  2000年   51篇
  1999年   47篇
  1998年   39篇
  1997年   37篇
  1996年   37篇
  1995年   39篇
  1994年   43篇
  1993年   44篇
  1992年   37篇
  1991年   32篇
  1990年   20篇
  1989年   38篇
  1988年   21篇
  1987年   28篇
  1986年   26篇
  1985年   34篇
  1984年   36篇
  1983年   32篇
  1982年   33篇
  1981年   30篇
  1980年   24篇
  1979年   14篇
  1978年   15篇
  1977年   13篇
  1975年   16篇
  1974年   12篇
  1973年   17篇
排序方式: 共有2866条查询结果,搜索用时 31 毫秒
211.
212.
The article describes the case of a 29-year-old woman who was found dead in her apartment on a bar stool with the body being maximally retroflected in the lumbar region, the head hanging down and the feet and hands barely touching the floor. On external inspection of the body the cuff-like distribution of hypostasis on the forearms and lower legs was consistent with the position in which the body was found. There were no signs of foreign intervention. At autopsy massive congestion was found in the internal organs as well as pulmonary and cerebral edema. In the ventral region of the lumbar intervertebral discs superficial hemorrhages were detected. The alcohol content was 3.40 per thousand in the blood and 4.43 per thousand in the urine. As the essential pathogenetic mechanisms responsible for death reduced venous reflux to the heart in combination with postural asphyxia and the influence of alcohol are discussed.  相似文献   
213.
214.
Suicide by asphyxiation with a plastic bag placed over the head is a method that has been advocated by right-to-die groups. Recently, such groups have proposed the introduction of helium into the plastic bag as a means of hastening death. Helium is readily available at toy stores, where it is sold in tanks for balloon inflation. It produces asphyxiation by the exclusion of oxygen in enclosed spaces. We report 7 fatalities throughout an 18-month period involving plastic bag suffocation in conjunction with helium use. These fatalities coincide with publication of an update to a popular right-to-die text in which this method is described. Although right-to-die literature was absent from all scenes, this method was not previously observed in our jurisdiction, and the deaths likely reflect exposure to this information. Because of analytical difficulties in testing for helium in biologic specimens, death certification rests on scene investigation.  相似文献   
215.
The authors present a case of sudden death in a previously healthy 36-year-old male. At autopsy there were bilateral pulmonary thromboemboli and right ventricular dilatation. Histologic findings in the lungs included recanalized, old thrombi and evidence of pulmonary hypertension. Genetic analysis for hereditary risk factors was heterozygous positive for the prothrombin G20210A mutation. Implications of this finding, its history and the diagnostic technique shall be discussed. The authors recommend that all cases of deep venous thromboses and pulmonary thromboemboli lacking known risk factors be evaluated for newly described genetic variations associated with an increased risk for venous thrombosis.  相似文献   
216.
217.
Until recently, physicians were viewed as the dominant player in health policy. Now, however, they compete with many other effective interest groups. This article analyzes this changing role, and specifically how organized medicine has changed its approach to influencing health policy. The essay begins with a review of the reasons for the growth and subsequent decline of physicians' influence. This is followed by a case study of physician payment reform under Medicare, which illustrates the ways in which organized medicine chooses when and when not to cooperate with government. The article concludes with a discussion of where physicians are likely to continue to be influential in future health policy reform. Three such areas are noted: payment policy, quality and clinical innovation, and medical education and training.  相似文献   
218.
The number of injection drug users frequenting the long-awaited supervised injection site in the Downtown Eastside has steadily increased since the site opened in September 2003. However, there are concerns about the restrictions imposed by Health Canada and about the activities of the Vancouver Police.  相似文献   
219.
The paperwork has been processed, and Health Canada says that two pilot supervised injection sites (SISs) in Vancouver can now proceed, but operational funding for the site to be located in the Downtown Eastside has yet to be secured. Meanwhile, tired of waiting for the sanctioned SISs to open, community groups in Vancouver have begun to operate unsanctioned sites. There are also concerns that even if operational funding for the Downtown Eastside site is obtained, the pilot SIS project is too small in scope to make a major impact on public health in the area.  相似文献   
220.
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