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   18827篇
  免费   1181篇
各国政治   812篇
工人农民   887篇
世界政治   1211篇
外交国际关系   592篇
法律   13134篇
中国共产党   2篇
中国政治   112篇
政治理论   3158篇
综合类   100篇
  2023年   83篇
  2021年   96篇
  2020年   446篇
  2019年   471篇
  2018年   597篇
  2017年   631篇
  2016年   710篇
  2015年   522篇
  2014年   560篇
  2013年   1956篇
  2012年   510篇
  2011年   548篇
  2010年   564篇
  2009年   585篇
  2008年   547篇
  2007年   543篇
  2006年   558篇
  2005年   477篇
  2004年   473篇
  2003年   400篇
  2002年   440篇
  2001年   713篇
  2000年   640篇
  1999年   521篇
  1998年   251篇
  1997年   183篇
  1996年   207篇
  1995年   198篇
  1994年   181篇
  1993年   185篇
  1992年   326篇
  1991年   335篇
  1990年   323篇
  1989年   311篇
  1988年   337篇
  1987年   278篇
  1986年   346篇
  1985年   339篇
  1984年   260篇
  1983年   238篇
  1982年   186篇
  1981年   167篇
  1980年   150篇
  1979年   234篇
  1978年   133篇
  1977年   106篇
  1975年   103篇
  1974年   133篇
  1973年   88篇
  1972年   87篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
De Vault  James M. 《Public Choice》2002,110(1-2):1-22
This study examines the unfair trade decisions of the InternationalTrade Commission (ITC) and how they have been affected by Congress.It begins by identifying the means Congress can use to influenceITC decisions and then estimates both the extent to which thesemeans have been used and the extent to which they have shaped theITC's behavior. The study reaches two conclusions. First, Congresshas tried to shape the ITC's behavior, but it has not tried tomicromanage this behavior. Second, while the ITC's behavior hasbeen influenced by Congress, congressional influence is not asimportant as other factors, such as statutory criteria.  相似文献   
82.
83.
84.
85.
Observations of high velocity bloodspatter on adjacent objects   总被引:1,自引:0,他引:1  
In a recent homicide investigation, high velocity backspatter was observed on the sleeve cuff of the accused. These minute droplets were discovered only after microscopic examination and were limited in number. A study was initiated to determine if these were truly backspatter droplets or transferred blood produced from light contact with a bloody item. It was observed that the backspattered blood was primarily limited to contact or near contact shots. An exception was a shot into an already bloody surface. It was found that backspattered blood would deposit on the shooter's shirt sleeve irrespective of the weave pattern. Transferred blood was observed only on the fiber tops. This information was found to be useful in reconstruction of events in suicides as well as possible homicides.  相似文献   
86.
Book Reviews in This Article:
Getting Rid of Patients: Contradictions in the Socialization of Physicians . By Terry Mizrahi
Physicians and Social Change . By John Colombotos and Corinne Kirchner
Changing Values in Medicine . Edited by Eric J. Cassell and Mark Siegler
Professional Ethics and Primary Care Medicine: Beyond Dilemmas and Decorum . By Harmon L. Smith and Larry R. Churchill
Physician—Patient Decision-Making: A Study in Medical Ethics . By Douglas N. Walton
With Dignity: The Search for Medicare and Medicaid . By Sheri I. David
The Dismissal of Students with Mental Disorders. Legal Issues, Policy Considerations, and Alternative Responses .
Courtroom Toxicology . By Marshall Houts, Randall C. Baselt, and Robert H. Cravey  相似文献   
87.
88.
89.
90.
In order to cooperate with voluntary screening programs aimed at the surveillance of the HIV epidemic in Finland, we have studied medicolegal autopsies for HIV antibodies since 1986 using an enzyme immunoassay on postmortem sera. The investigation covered 47.4% and 39.2%, respectively, of all deaths under the age of 65 years in the metropolitan areas of Helsinki and Turku--two cities on the densely populated southern coast of Finland from which most HIV infections have thus far been detected. Nine HIV-positive cases (0.12%) were detected among the 7305 medicolegal autopsies tested in 1986 to 1990. This figure is higher than the prevalence of 0.01 to 0.03% in voluntary screening programs for the general population would suggest. Seven of our cases had previously tested positive, and two were previously unknown cases, indicating that people at high risk are clustered in the medicolegal autopsy series. Of the six cases in an early stage of infection, three committed suicide suggesting the importance of HIV-screening in suicide cases in tracing symptomless HIV carriers. Five of the cases were detected in 1990, a year when the number of new HIV infections had more than doubled compared to the previous two years. This suggests that testing of medicolegal autopsies as surrogate tests for the population gives useful information even in low-prevalence areas like Finland. Such testing has none of the ethical problems of many other back-up surveys, and may be particularly sensitive to early changes in epidemiology.  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