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   12137篇
  免费   1255篇
各国政治   449篇
工人农民   388篇
世界政治   865篇
外交国际关系   299篇
法律   9331篇
中国共产党   1篇
中国政治   96篇
政治理论   1884篇
综合类   79篇
  2023年   173篇
  2021年   76篇
  2020年   343篇
  2019年   343篇
  2018年   391篇
  2017年   451篇
  2016年   472篇
  2015年   431篇
  2014年   421篇
  2013年   1220篇
  2012年   284篇
  2011年   372篇
  2010年   549篇
  2009年   503篇
  2008年   285篇
  2007年   251篇
  2006年   366篇
  2005年   253篇
  2004年   245篇
  2003年   238篇
  2002年   220篇
  2001年   445篇
  2000年   355篇
  1999年   300篇
  1998年   149篇
  1997年   131篇
  1996年   103篇
  1995年   132篇
  1994年   143篇
  1993年   117篇
  1992年   218篇
  1991年   240篇
  1990年   218篇
  1989年   233篇
  1988年   209篇
  1987年   180篇
  1986年   211篇
  1985年   228篇
  1984年   224篇
  1983年   188篇
  1982年   147篇
  1981年   131篇
  1980年   133篇
  1979年   151篇
  1978年   92篇
  1977年   80篇
  1976年   67篇
  1975年   73篇
  1974年   77篇
  1973年   65篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
211.
The title of this paper comes from an incident that occurred while I was participating in morning rounds on the pediatric and surgical intensive care unit of a large, midwest tertiary care center. The patient under discussion was an eight-week-old girl who had been born without kidneys, and who had been cared for on the unit for seven weeks. In the previous week, the baby's condition had gone steadily downhill, as she experienced on medical catastrophe after another. One of the nurses asked the staff doctor who was leading rounds that morning, "What are the baby's chances?" The physician replied, "Her chances are slim." To which one of the young residents immediately answered, "Slim just left town."  相似文献   
212.
213.
Deoxyribonucleic acid (DNA) was isolated from a number of spongy and compact human bone tissue specimens, and the yield was estimated on a "per milligram of starting tissue" basis. DNA was, in addition, isolated from a number of corresponding blood and bone tissue specimens. Spectrophotofluorometry and ethidium bromide visualization on minigels were used to estimate the quantity and degree of degradation of DNA. The DNA from several blood-bone pairs is shown to give concordant restriction fragment length polymorphism (RFLP) typing results by two different typing protocols with five different single-locus probes. DNA from several additional blood-bone pairs is shown to give concordant results for human leucocyte antigen (HLA)-DQ alpha phenotypes following polymerase chain reaction (PCR) amplification and hybridization to specific allele-specific oligonucleotide (ASO) probes, and for the variable numbers of tandem repeats (VNTR) length polymorphisms 3' to the human apolipoprotein B (APOB) gene following PCR amplification with specific primers and analysis of the products by electrophoresis and ethidium bromide visualization.  相似文献   
214.
215.
This Article examines the issues and questions which underlie the debate over the admission of "medical treatises" into evidence. The admissibility of this type of evidence is at issue most often in litigation involving complex medico-legal issues. This article outlines the evidentiary basis for admission of medical treatises and discusses the quality of medical treatises in an effort to determine what value to the fact-finder these treatises actually hold. The authors contend that there is an inherent untrustworthiness associated with medical treatises, but do not go so far as to suggest that medical treatises should never be admitted. The Article concludes that there is a need for greater caution in determining admissibility and recommends safeguards to better guarantee trustworthiness and reliability.  相似文献   
216.
The Equal Employment Opportunity Commission (EEOC) recently issued its final regulations on the Americans with Disabilities Act (ADA). Although the regulations offer some guidance for employers on how to comply with the Act, they fail to provide specific answers to the many complicated compliance questions that will surely arise. Further, the regulations are almost totally silent on certain critical issues related to insurance, workers' compensation, and potential conflicts between ADA obligations and terms of collective bargaining agreements. The EEOC has essentially left the resolution of many important ADA questions to case-by-case determination and the litigation process.  相似文献   
217.
In 1989, after almost two decades of substance-by-substance standard setting, the Occupational Safety and Health Administration (OSHA) promulgated its Air Contaminants Standard, imposing new exposure limits for 376 toxic substances encountered in U.S. industry. In marked contrast to earlier regulations, the Air Contaminants Standard has generated relatively little industry opposition. This paper analyzes the standard in the context of the twenty-year debate over the appropriate role for technological feasibility and economic compliance costs in occupational health policy. The political feasibility of the new standard is traced to OSHA's abandonment of "technology forcing" in favor of reliance on "off-the-shelf" technologies already in use in major firms. While important as an embodiment of OSHA's new "generic" approach to regulation, the Air Contaminants Standard cannot serve as a model for future occupational health policy, due to its reliance on informal, closed-door mechanisms for establishing regulatory priorities and permissible exposure limits.  相似文献   
218.
219.
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