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   13471篇
  免费   1281篇
各国政治   651篇
工人农民   405篇
世界政治   922篇
外交国际关系   372篇
法律   10127篇
中国共产党   8篇
中国政治   92篇
政治理论   2094篇
综合类   81篇
  2021年   63篇
  2020年   374篇
  2019年   379篇
  2018年   488篇
  2017年   535篇
  2016年   567篇
  2015年   512篇
  2014年   465篇
  2013年   1325篇
  2012年   334篇
  2011年   417篇
  2010年   588篇
  2009年   563篇
  2008年   378篇
  2007年   380篇
  2006年   492篇
  2005年   306篇
  2004年   295篇
  2003年   276篇
  2002年   270篇
  2001年   486篇
  2000年   394篇
  1999年   319篇
  1998年   156篇
  1997年   139篇
  1996年   110篇
  1995年   135篇
  1994年   151篇
  1993年   117篇
  1992年   223篇
  1991年   244篇
  1990年   226篇
  1989年   240篇
  1988年   218篇
  1987年   189篇
  1986年   216篇
  1985年   238篇
  1984年   224篇
  1983年   194篇
  1982年   150篇
  1981年   143篇
  1980年   130篇
  1979年   158篇
  1978年   97篇
  1977年   81篇
  1976年   67篇
  1975年   72篇
  1974年   79篇
  1973年   66篇
  1971年   57篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
133.
134.
The author examines the effect of rapid population growth due to migration on the parish of Tenango del Valle, Mexico, during the eighteenth century. She gives special consideration to the impact on quality of life in indigenous villages, especially for widows and female heads of households who were impoverished as a result of discriminatory land transactions. Data are mainly from the parish register for 1770.  相似文献   
135.
Book reviews     
Turkey in the Middle East By Philip Robins. Pinter for the Royal Institute of international Affairs. 1991.130 pp. £22.50. ISBNO 86187 198 7. PBk £8.95. ISBN 0 86187 1995.

Hitler Slept Late and other blunders that cost him the war By James P. Duffy. London: Praeger. 1991.176pp. £17.50.

Alliance within the alliance: Franco‐German Military Cooperation and the European Pillar of Defense By David G. Haglund. Boulder: Westview Press, 1991. 213 pp.

Homeward Bound? Allied Forces in the New Germany Edited by David G. Haglund and Olaf Mager. Boulder: Westview Press, 1992. 299 pp. £24.95

Avoiding War: Problems of crisis management By Alexander L. George (ed.), Westview Press, 1991. 590 pp. £16.95.

The Future of NATO: Facing an Unreliable Enemy in an Uncertain Environment By S.N. Drew et al. Praeger Publishers, New York, 1991. pp. 206.

Parliament and international relations Edited by Charles Carstairs and Richard Ware. Milton Keynes: Open University Press, 1991. 195 pp. £12.99 (paperback)  相似文献   

136.
137.
Danger: implants     
The superheated debate over breast implants awakened a sleeping giant of an issue clouding "medical devices"--the government's clumsy nomenclature for any medical product that is not a drug, from breast implants and artificial hips to X-ray machines and surgical thread. Some 130 categories of high-risk devices are in use with little or no proof of safety, reliability or effectiveness. All appeared before 1976, the year that the Food and Drug Administration got the authority to regulate such products. Under activist chief David Kessler and with added clout from a 1990 law, the FDA plans to scrutinize the entire 130-item list. Five will get special attention starting early next year: saline-filled breast implants, inflatable penile implants, testicular implants, heart-bypass pumps and cranial stimulators. U.S. News has looked at all five devices, using FDA data obtained through the Freedom of Information Act. In-depth computer analysis suggested that penile implants deserve closer examination. Why is clear from the following report.  相似文献   
138.
139.
140.
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   
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