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   13124篇
  免费   334篇
各国政治   525篇
工人农民   450篇
世界政治   883篇
外交国际关系   365篇
法律   8490篇
中国政治   79篇
政治理论   2560篇
综合类   106篇
  2020年   132篇
  2019年   184篇
  2018年   215篇
  2017年   256篇
  2016年   260篇
  2015年   187篇
  2014年   224篇
  2013年   1152篇
  2012年   274篇
  2011年   334篇
  2010年   252篇
  2009年   306篇
  2008年   327篇
  2007年   337篇
  2006年   328篇
  2005年   315篇
  2004年   312篇
  2003年   313篇
  2002年   299篇
  2001年   558篇
  2000年   481篇
  1999年   363篇
  1998年   185篇
  1997年   139篇
  1996年   155篇
  1995年   153篇
  1994年   160篇
  1993年   157篇
  1992年   286篇
  1991年   314篇
  1990年   294篇
  1989年   324篇
  1988年   299篇
  1987年   289篇
  1986年   329篇
  1985年   317篇
  1984年   265篇
  1983年   252篇
  1982年   170篇
  1981年   159篇
  1980年   131篇
  1979年   173篇
  1978年   104篇
  1977年   131篇
  1976年   116篇
  1975年   102篇
  1974年   117篇
  1973年   116篇
  1972年   108篇
  1971年   91篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Medical training in the United States often takes the form of a grueling endurance test in which patients are often those most at risk. This Article discusses sleep deprivation among resident physicians in the United States with an eye towards resolving the problem through legal channels. It analyzes the effects of sleep deprivation on resident physicians, with subsequent discussion of the implications for patient care and medical training. Next, it makes comparisons to medical training in other developed nations, as well as regulations that exist in the airline and trucking industries, where public safety is a principal concern. Furthermore, this Article discusses proposals to mend the dilemmas created by sleep-deprived resident physicians through statutory and regulatory reform, deterrence by way of tort law, and unionization or collective bargaining.  相似文献   
994.
The authors are privileged to have been provided with correspondence about a dispute over the ongoing storage of genetic material (as Guthrie Cards) in Victoria. The correspondence details confusion over the roles of government and the private sector service provider in accounting for the storage, use and destruction of these stored genetic materials collected as part of a government public health program. The purpose in publishing this account is to highlight the present inadequacies in current practices and the ongoing potential for a crisis in the management of collected genetic materials through a lack of appropriate regulation, transparency and accountability. The article suggests measures to remedy some of the existing inadequacies in contractual arrangements and recommends that the government retain ownership and control of both the genetic materials and the derived information to ensure some accountability in the present legal environment.  相似文献   
995.
996.
On 4 October 2000, Bill 119 (or the Red Tape Reduction Act, 2000) was introduced and received first reading in Ontario's provincial legislature. Like many of the other similarly titled bills the Harris government has introduced, Bill 119 proposes to change a long list of existing statutes in an effort to make Ontario more business friendly. Schedule G of Bill 119 sets out a mechanism whereby a viatical industry in Ontario would be made legal if a licensing scheme is first put in place by the Ministry of Finance.  相似文献   
997.
998.
The abortion law of New Zealand appears to have been interpreted very liberally over recent years by sectors of the medical profession. Indeed the interpretation of the law appears to have been so liberal that it raises questions as to the lawfulness of many of the abortions carried out in New Zealand. The current practice and application of the abortion law is such that it may expose some medical consultants certifying and performing abortions to criminal proceedings and civil claims.  相似文献   
999.
Forensic DNA laboratories worldwide have begun using multiplexed STR systems to decrease analysis time and increase sample throughput. The loci used in these systems are basically "nonsense" regions of human DNA. However, due to the chromosome on which some of these loci are located, various genetic abnormalities can sometimes be detected. This paper will show one such abnormality--Klinefelter's Syndrome--and the process used to show the possibility of this defect in two undiagnosed males using peak height ratios at the Amelogenin locus, and X-Y STRs.  相似文献   
1000.
At issue in this case was whether an unusual window defect seen in two of the crime scene photographs was due to a bullet and if so, if that same bullet fatally wounded the victim. The window appeared to have been cracked prior to the apparent shot through it. A .22 bullet recovered from autopsy, when examined only by light microscopy, failed to show associated glass fragments. A previously cracked test window was shot a number of times with .22 caliber bullets near the cracks in an effort to simulate the window defect seen in the crime scene photographs. Several of the defects produced by the test window shots appeared similar to the crime scene window defect. The .22 bullet taken from the victim and several of the test bullets (collected by a cotton box) were examined by scanning electron microscopy/energy dispersive X-ray spectroscopy. The test bullets showed glass particles on and embedded in their surfaces. Particles of similar size and composition were found embedded in the surface of the bullet from the victim. The bullet likely struck the window prior to hitting the victim. It was apparent by the morphology of some of the mushroomed test .22 bullets that they hit the window crack. These bullets showed that the glass on one side of a crack often fails before the other side during the strike. Aggregations of powdered glass on many of the mushroomed surfaces of the .22 bullets suggest that as the bullet mushrooms during impact on the window surface, the glass in contact with the bullet powderizes and coats the mushroomed surface of the bullet with a layer of fine glass particles.  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