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   17253篇
  免费   505篇
各国政治   729篇
工人农民   662篇
世界政治   1450篇
外交国际关系   583篇
法律   10276篇
中国共产党   2篇
中国政治   76篇
政治理论   3807篇
综合类   173篇
  2020年   214篇
  2019年   252篇
  2018年   322篇
  2017年   388篇
  2016年   413篇
  2015年   288篇
  2014年   330篇
  2013年   1657篇
  2012年   415篇
  2011年   432篇
  2010年   349篇
  2009年   388篇
  2008年   443篇
  2007年   471篇
  2006年   454篇
  2005年   401篇
  2004年   398篇
  2003年   420篇
  2002年   376篇
  2001年   676篇
  2000年   617篇
  1999年   511篇
  1998年   288篇
  1997年   251篇
  1996年   214篇
  1995年   213篇
  1994年   248篇
  1993年   227篇
  1992年   341篇
  1991年   374篇
  1990年   335篇
  1989年   353篇
  1988年   319篇
  1987年   339篇
  1986年   340篇
  1985年   331篇
  1984年   288篇
  1983年   318篇
  1982年   258篇
  1981年   241篇
  1980年   182篇
  1979年   251篇
  1978年   168篇
  1977年   146篇
  1976年   133篇
  1975年   124篇
  1974年   138篇
  1973年   117篇
  1972年   113篇
  1971年   96篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
182.
183.
This paper provides a brief biography of Luke S. May (1886-1965), whose pioneering work in forensic science in the United States has not received full recognition. May began as a private detective in Salt Lake City, Utah, shortly after the turn of the century and later established his own agency, the Revelare International Secret Service, which he moved to Seattle, Washington, in 1919. Although basically self-taught in scientific matters, May built a solid reputation among police agencies and attorneys in the Pacific Northwest and Western Canada as a serious and effective scientific investigator in the era before public crime laboratories. This reputation as "America's Sherlock Holmes" also led to his being consulted on the establishment of the first American crime laboratory at Northwestern University in Chicago, Illinois, and on a laboratory for the Royal Canadian Mounted Police at Regina, in Saskatchewan, Canada. He contributed to a landmark case of court acceptance of toolmark identification, invented specialized instruments, and founded an institute to teach scientific criminal investigation to police officers. His earliest associates were John L. Harris and J. Clark Sellers, both of whom became recognized document examiners on the West Coast and were followed by a second and a third generation of practitioners.  相似文献   
184.
185.
186.
In this article we examine how increasing the reimbursement of physicians and expanding Medicaid eligibility affect access to care for children in Cook County, Illinois, which overlies Chicago. Using Medicaid claims and other data at the zip-code level, we compare the places where Medicaid children live with the places where all the physicians who treat children and those who accept Medicaid patients have their practices. Our findings suggest that the recent changes in legislation are unlikely to benefit extremely poor children, who are more likely to live in depressed inner-city areas, where there are few physicians. "Near-poor" children whose homes are dispersed throughout the county, who are now eligible for Medicaid as a result of the recent changes, are likely to see improvements in their access to care. Further changes in policy, aimed at enhancing the capacity of institutions providing care, could improve access for the children of the inner city.  相似文献   
187.
188.
189.
We report seven fatalities resulting from the ingestion of illicit drugs packaged in condoms, rubber balloons, or plastic bags which were observed in the last 4 years at the Office of the Chief Medical Examiner, State of Maryland. All the victims, with the exception of one, were men ranging in age from 19 to 37 years. There was no racial predominance. No drug paraphernalia was found at any scene. In two cases, seizure-like activity was documented. One victim had recently returned from Nigeria; therefore, Lassa fever was initially suspected. Two of the victims were "body packer" contrabanders who had just arrived from Africa. They used body cavities to hide large amounts of heroin to avoid U.S. Customs. The other five cases were "mini-packers," small-time illicit drug dealers who had swallowed a single bag of cocaine to avoid police detection. The possible mechanism of leaking or rupture of the latex container is discussed.  相似文献   
190.
During preliminary examination of the body of a homicide victim, a peculiar red "fiber" was noticed and recovered. Initially believing this to be a carpet fiber, the item was subjected to fiber analysis. It was found to be a short coiled particle not like any known natural or synthetic fabric fiber. Subsequent examinations determined this "fiber" to be the larva of a common freshwater midge (Diptera; Chironomidae). Chironomid larvae have been observed on other bodies recovered from freshwater environments. Entomological studies of this organism have led to the conclusion that the presence of chironomid larvae indicates submersion of the body.  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