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   17374篇
  免费   528篇
各国政治   980篇
工人农民   740篇
世界政治   1215篇
外交国际关系   647篇
法律   10373篇
中国共产党   5篇
中国政治   202篇
政治理论   3583篇
综合类   157篇
  2020年   222篇
  2019年   281篇
  2018年   398篇
  2017年   434篇
  2016年   430篇
  2015年   335篇
  2014年   352篇
  2013年   1979篇
  2012年   442篇
  2011年   530篇
  2010年   411篇
  2009年   443篇
  2008年   487篇
  2007年   446篇
  2006年   467篇
  2005年   411篇
  2004年   442篇
  2003年   434篇
  2002年   373篇
  2001年   601篇
  2000年   579篇
  1999年   462篇
  1998年   259篇
  1997年   224篇
  1996年   219篇
  1995年   192篇
  1994年   203篇
  1993年   210篇
  1992年   326篇
  1991年   325篇
  1990年   315篇
  1989年   305篇
  1988年   308篇
  1987年   319篇
  1986年   326篇
  1985年   302篇
  1984年   295篇
  1983年   305篇
  1982年   184篇
  1981年   161篇
  1980年   151篇
  1979年   199篇
  1978年   149篇
  1977年   132篇
  1976年   126篇
  1975年   116篇
  1974年   112篇
  1973年   118篇
  1972年   112篇
  1968年   96篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
In the course of a scuffle a 50-year old man has been shot by a revolver. The culprit and witnesses state, there has been only one shot, whereas the victim declared having been shot twice. The medico-legal investigation revealed a gunshot wound that passed through the left thigh, a grazing shot of the right hand and a superficial lesion of the skin at the forehead with sprinkled gunshot residue in the epidermis. The investigation confirmed the statement of the victim: the first shot to the forehead was caused by a plastic training cartridge, the second to the right hand and thigh by a cartridge loaded with an ordinary bullet.  相似文献   
922.
923.
924.
We describe a method for obtaining specific and reproducible deoxyribonuclease I (DNase I) typing from liquid semen. Isoelectric focusing of the enzymes on polyacrylamide gel (IEF-PAGE, pH 3.5-5) was accomplished using a 0.5-mm thick gel. The separated isozymes were visualized by a new activity staining method, dried agarose film-overlay (DAFO). Pretreatment of semen samples with neuraminidase markedly enhanced the isozyme-band resolution and sensitivity. The method was simple and reliable, with high resolution and sensitivity. The DNase I types in semen samples were correlated with the types found in corresponding blood and urine samples. DNase I typing could therefore provide an additional discriminant characteristic in the forensic examination of semen.  相似文献   
925.
A reversible technique is presented in which the root morphology of missing teeth in skeletonized human remains can be reconstructed for the purpose of radiographic comparison and postmortem identification. In this technique, which is based upon pilot studies with skeletonized mandibles of archival remains, the alveolar socket walls are sealed with a coat of cyanoacrylate cement and injected with a mixture of vinyl polysiloxane and barium sulfate. Radiographs are produced with the radiopaque mixture in place, which highlights the antemortem morphology of the roots. Subsequently, the impression material is removed, resulting in no gross alteration of the evidence. The radiographs made with this technique, as well as the impressions, can be stored for later use at a trial or pending the discovery of antemortem dental evidence.  相似文献   
926.
By gathering and disseminating information, members of the Committee on Ways and Means, and committee staff under their supervision, have played an important role in informing the debate on poverty issues during the 1980s. In the face of President Reagan's 1981 budget program, which reduced spending in the major antipoverty programs, committee members targeted substantial resources to an ongoing, albeit ad hoc, education process. The process has not only provided evidence of the adverse impact of the 1981 reductions on the poor, but has also made new contributions to the understanding of poverty. Although many other factors have contributed to outcomes in poverty policy during the 1980s, it is clear that this education process played an important role in the successes achieved thus far; partial reversal of the 1981 reductions has been achieved, tax changes have been implemented which help low-income families, and a welfare reform bill has been enacted.  相似文献   
927.
Between 1987 and 1989 there were approximately 5,000 cases of fatal and injury-sustained road traffic accidents, of which 2.3-3.0% were alcohol related (blood alcohol levels greater than the legal limit of 80 mg% ethanol). The offenders of alcohol-related accidents are mostly Chinese (> 79%), male (> 98%), and more often 30-40 years old. The majority of the alcohol-related accidents (> 74%) took place between 8 P.M. and 4 A.M. in fine weather and light traffic. Rear-end, head-on, and side-on collisions comprised > 60% of all the alcohol-related accidents, and losing control of vehicles approximately 30%. Drunken driving cases for the same period that were not accidents showed a number of characteristics similar to those for accidents. In Singapore, motorcycle riders and pedestrians are more prone to road fatality than other road-user groups. International comparisons of road fatalities per 100,000 population gave Singapore one of the lowest accident rates (8.1-8.4) as compared with countries such as Australia, the United Kingdom, the United States, New Zealand, Canada, and Japan.  相似文献   
928.
In the 14-year period from 1976 to 1989, there have been 174 homicide victims in the Auckland colonial area. Data accessed from autopsy and police reports show that victims of marital conflict, family dispute, and arguments developing between nonmarried couples made up the largest proportion of homicide cases. Stabbing and assault with a blunt weapon were the most common causes of death. The data also show that homicide is relatively uncommon in Auckland in comparison with other cities of similar size.  相似文献   
929.
930.
Over the past fifteen years the national government in the Federal Republic of Germany has animated the political debate about rising health care expenditures. However, it has only provided health policy leadership by shifting the burden of financing health and medical care to others. This paper presents three cases that illustrate the political and institutional constraints inherent in the German policy process that limit the proposal and implementation of appropriate policy solutions to rising health care costs. Cost controls have been inhibited because of the near-universal entitlement of national health insurance, the access all social groups have to advanced medical care, and policies targeted at providers rather than users of health services. The paper also underscores the past and future importance of regional policy coalitions in shaping national health policy.  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