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   9258篇
  免费   311篇
各国政治   627篇
工人农民   382篇
世界政治   732篇
外交国际关系   397篇
法律   5320篇
中国共产党   2篇
中国政治   140篇
政治理论   1879篇
综合类   90篇
  2020年   121篇
  2019年   140篇
  2018年   202篇
  2017年   226篇
  2016年   235篇
  2015年   195篇
  2014年   204篇
  2013年   1151篇
  2012年   239篇
  2011年   321篇
  2010年   233篇
  2009年   249篇
  2008年   256篇
  2007年   234篇
  2006年   233篇
  2005年   207篇
  2004年   229篇
  2003年   243篇
  2002年   168篇
  2001年   359篇
  2000年   335篇
  1999年   297篇
  1998年   145篇
  1997年   103篇
  1996年   113篇
  1995年   103篇
  1994年   111篇
  1993年   105篇
  1992年   163篇
  1991年   159篇
  1990年   148篇
  1989年   138篇
  1988年   160篇
  1987年   159篇
  1986年   162篇
  1985年   149篇
  1984年   145篇
  1983年   157篇
  1982年   92篇
  1981年   68篇
  1980年   80篇
  1979年   99篇
  1978年   79篇
  1977年   66篇
  1976年   71篇
  1975年   60篇
  1973年   51篇
  1972年   53篇
  1971年   54篇
  1969年   54篇
排序方式: 共有9569条查询结果,搜索用时 15 毫秒
191.
Gorman C 《Time》1991,138(16):83
  相似文献   
192.
The role of the forensic toxicologist in helping to determine causes of death or in aiding in the resolution of "driving under the influence" or similar cases is well known and clearly understood. Less clearly defined is the position of the forensic toxicologist vis-à-vis other socially significant problems. However, as the 21st century approaches, it is worth considering how forensic toxicology can help in unraveling some of these problems. The problem of violence between intimates--that is, domestic violence--is a social problem in which it has been long felt that alcohol has played a part. Until now, though, no carefully controlled toxicological studies have been conducted to substantiate this or to determine whether other drug use is associated with domestic violence. At the San Francisco Medical Examiner's Office, toxicological data from both the victim and the suspect in 20 cases of domestic violence that ended in homicide have been gathered. It was found that alcohol or other drugs or a combination of these factors was invariably present in the suspect, the victim, or both. The implications of these results and how they can be used to develop a toxicological strategy to help reduce the most serious consequences of domestic violence are presented.  相似文献   
193.
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   
194.
195.
196.
197.
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   
198.
199.
In Summit Health Ltd. v. Pinhas, the United States Supreme Court by a narrow majority found that the exclusion of an ophthalmologist from a hospital in Los Angeles had a sufficient effect on interstate commerce to establish federal jurisdiction under the Sherman Act. In resolving a split among the federal circuit courts of appeal, the Court applied the broad jurisdictional test from McLain v. Real Estate Board of New Orleans, Inc. to peer review proceedings. Despite many ambiguities in the majority opinion by Justice Stevens and a scathing dissent by Justice Scalia, the effect of Pinhas will be to increase the suits in federal court on antitrust grounds brought by aggrieved medical staff members and applicants denied appointments or privileges, and to decrease, if not eliminate, the likelihood of preliminary dismissal on jurisdictional grounds. This, in turn, should serve to emphasize the importance of complying with the Health Care Quality Improvement Act in order to obtain immunity from damages under federal antitrust and state laws.  相似文献   
200.
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