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   18561篇
  免费   536篇
各国政治   916篇
工人农民   686篇
世界政治   1490篇
外交国际关系   660篇
法律   11194篇
中国共产党   9篇
中国政治   85篇
政治理论   3876篇
综合类   181篇
  2021年   102篇
  2020年   245篇
  2019年   285篇
  2018年   424篇
  2017年   470篇
  2016年   519篇
  2015年   368篇
  2014年   377篇
  2013年   1777篇
  2012年   459篇
  2011年   479篇
  2010年   387篇
  2009年   445篇
  2008年   533篇
  2007年   576篇
  2006年   565篇
  2005年   445篇
  2004年   438篇
  2003年   454篇
  2002年   433篇
  2001年   711篇
  2000年   649篇
  1999年   519篇
  1998年   289篇
  1997年   248篇
  1996年   207篇
  1995年   204篇
  1994年   245篇
  1993年   218篇
  1992年   341篇
  1991年   377篇
  1990年   334篇
  1989年   351篇
  1988年   324篇
  1987年   339篇
  1986年   345篇
  1985年   342篇
  1984年   287篇
  1983年   322篇
  1982年   254篇
  1981年   246篇
  1980年   178篇
  1979年   254篇
  1978年   168篇
  1977年   146篇
  1976年   130篇
  1975年   121篇
  1974年   136篇
  1973年   120篇
  1972年   114篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
In the current study the objective was to find to what extent a reliable determination of age at death is made possible by establishing the degree of aspartic acid racemization in the dentin of teeth. The results of the investigation of 46 teeth are in agreement with the values found by other authors. The method presented makes a reproducible and accurate estimation of age possible. We intend to elaborate and improve this promising method for determination of age at death. The relevant points are presented here.  相似文献   
172.
173.
174.
Modern antitrust policy has a ‘love hate’ relationshipwith non-standard contracts that can overcome market failure.On the one hand, courts have abandoned various per se rulesthat once condemned such agreements outright, concluding thatmany non-standard contracts may produce benefits that are cognizableunder the antitrust laws.1 The prospect of such benefits, itis said, compels courts to analyze these agreements under theRule of Reason, under which the tribunal determines whethera given restraint enhances or destroys competition.2 At thesame time, courts, scholars, and the enforcement agencies haveembraced methods of rule of reason analysis that are undulyhostile to such agreements.3 In particular, courts and othersare too quick to view such agreements and the market outcomesthey produce as manifestations of market power. This articleseeks to explain why these agreements are still the object ofundue hostility.  相似文献   
175.
176.
177.
178.
This report assesses the effects on peripheral oxygen saturation and heart rate that positional restraint induces when a person is prone, handcuffed, and "hog-tied." Peripheral oxygen saturation and heart rate were monitored at rest, during exercise, and during recovery from exercise for 10 adult subjects. The effects of positional restraint produced a mean recovery time that was significantly prolonged. Consequently, the physiological effects produced by positional restraint should be recognized in deaths where such measures are used.  相似文献   
179.
180.
This paper compares the Medicare prospective payment system (PPS) to four all-payer rate-setting systems that operated under HCFA waiver authority. The study examines the experience of Medicare, Medicaid, and commercial insurers under the two approaches. Data from several American Hospital Association surveys and from Medicaid 2082 report forms are analyzed. The paper concludes that the all-payer waiver programs have been as successful as PPS in controlling the rate of growth in Medicare costs. In addition, Medicaid programs are more successful in controlling their outlays in all-payer rate-setting environments than when they "go alone." Finally, there is no evidence to suggest that hospitals can increase charges in response to greater financial need under either PPS or the state waivers. Nevertheless, it appears that commercial insurers are better able to compete with Blue Cross plans in all-payer rate-setting states than elsewhere.  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