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   16405篇
  免费   440篇
各国政治   708篇
工人农民   574篇
世界政治   1156篇
外交国际关系   514篇
法律   10046篇
中国政治   104篇
政治理论   3596篇
综合类   147篇
  2020年   168篇
  2019年   242篇
  2018年   323篇
  2017年   336篇
  2016年   335篇
  2015年   251篇
  2014年   282篇
  2013年   1607篇
  2012年   345篇
  2011年   402篇
  2010年   349篇
  2009年   397篇
  2008年   408篇
  2007年   404篇
  2006年   420篇
  2005年   375篇
  2004年   371篇
  2003年   379篇
  2002年   364篇
  2001年   587篇
  2000年   503篇
  1999年   426篇
  1998年   247篇
  1997年   199篇
  1996年   198篇
  1995年   197篇
  1994年   198篇
  1993年   204篇
  1992年   324篇
  1991年   372篇
  1990年   347篇
  1989年   366篇
  1988年   332篇
  1987年   348篇
  1986年   378篇
  1985年   372篇
  1984年   341篇
  1983年   331篇
  1982年   235篇
  1981年   211篇
  1980年   191篇
  1979年   235篇
  1978年   151篇
  1977年   159篇
  1976年   155篇
  1975年   125篇
  1974年   148篇
  1973年   138篇
  1972年   125篇
  1969年   114篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
942.
943.
944.
945.
Reviews the need for and development of expanded school mental health (ESMH) programs, which provide a continuum of mental health promotion and intervention through school–community partnerships. Since ESMH is a relatively new, but increasingly prominent field, countless issues are being addressed in practice and research and in efforts to bridge practice and research. We review particular content and context dimensions of ESMH in need of development including quality assessment and improvement, empirically supported practice, improving assessment and outcome evaluation, involving educators in the work, understanding school environments, and tailoring programs through qualitative research. Summaries of articles that amplify these themes are provided.  相似文献   
946.
947.
The use of a new technique, Fourier transform infrared (FTIR) chemical imaging, has been demonstrated for the enhancement of latent fingermarks on a number of surfaces. Images of untreated fingermarks on glass backgrounds with excellent ridge detail were acquired using infrared chemical imaging. High quality fingermarks on glass backgrounds were also developed using ethyl cyanoacrylate (super glue) fuming and subsequent infrared chemical imaging. This new method allows the collection of images from backgrounds that traditionally pose problems for current fingermark detection methods. The background may, for example, be highly colored, have a complex pattern, or possess other pattern or image characteristics that make it difficult to separate fingermark ridges using traditional optical or luminescent visualization. One background that has proven to be a challenging surface for the development of latent fingermarks is the Australian polymer banknote. To demonstrate the power and applicability of infrared chemical imaging, fingermarks fumed with ethyl cyanoacrylate were successfully imaged from Australian polymer banknotes.  相似文献   
948.
Sexually dimorphic distinctions within the human thoracic area may include morphological as well as metric differences in the sternum and 4th rib. This research assesses the validity of a set of previously published measurements from chest radiographs and their use in contemporary forensic situations. The chest plates from 130 adult individuals of a known sample undergoing medico-legal post-mortem examination were examined at autopsy. Thoracic radiographs were taken using a Faxitron cabinet X-ray machine at 40 kV using Kodak Diagnostic Film Ready Pack X-Omat TL. Measurements were taken to the nearest millimetre using a sliding calliper. Logistic regression analysis of measurements of the sternum and 4th rib was undertaken to determine sex. Using 4th rib width and sternal area, sex was predicted at an accuracy of 95.8% for males and 90.3% for females.  相似文献   
949.
Ehlers-Danlos Syndrome Type IV is an illness that often leads to premature death due to arterial rupture or dissection and is characterized by very fragile connective tissue. This report documents the death of a 30-year-old man with Ehlers-Danlos Syndrome Type IV from myocardial rupture and cardiac tamponade following a myocardial infarction. We believe that Ehlers-Danlos Syndrome Type IV contributed to the coronary atherosclerosis and myocardial rupture in this young man and that this disease led indirectly to his death by myocardial infarction, an unusual cause of death in this syndrome.  相似文献   
950.
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