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   24120篇
  免费   421篇
  国内免费   32篇
教育   17621篇
科学研究   2008篇
各国文化   220篇
体育   1778篇
综合类   34篇
文化理论   204篇
信息传播   2708篇
  2022年   132篇
  2021年   242篇
  2020年   388篇
  2019年   527篇
  2018年   743篇
  2017年   812篇
  2016年   764篇
  2015年   456篇
  2014年   614篇
  2013年   4573篇
  2012年   620篇
  2011年   680篇
  2010年   528篇
  2009年   500篇
  2008年   568篇
  2007年   548篇
  2006年   488篇
  2005年   423篇
  2004年   395篇
  2003年   356篇
  2002年   418篇
  2001年   452篇
  2000年   430篇
  1999年   428篇
  1998年   230篇
  1997年   252篇
  1996年   277篇
  1995年   243篇
  1994年   232篇
  1993年   217篇
  1992年   319篇
  1991年   320篇
  1990年   352篇
  1989年   337篇
  1988年   306篇
  1987年   265篇
  1986年   277篇
  1985年   343篇
  1984年   285篇
  1983年   273篇
  1982年   223篇
  1981年   230篇
  1980年   190篇
  1979年   253篇
  1978年   229篇
  1977年   210篇
  1976年   172篇
  1975年   136篇
  1974年   136篇
  1973年   155篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
All-day observations of captive American Robins (Turdus migratorius) revealed that the birds became extremely active at dusk, the time when wild Robins typically fly some distance to a communal roost site. This roosttime restlessness occurred during every month of the year, and so was distinguishable from the migratory restlessness that the birds displayed during early morning hours of spring months. The present observations also uncovered a recapitulation effect, in that the changes in activity level that occurred within any single day (from dawn through dusk) tended to parallel the changes in activity level that occurred across the year (from spring through winter).  相似文献   
974.
975.
Reading readiness varies as a function of family and environmental variables. This study of 11-year-old children (N = 39) was designed to determine if there was an additional or interactive contribution of brain structure. Evidence is presented that both environmental and biological variables predict phonological development. Temporal lobe (planar) asymmetry, hand preference, family history of reading disability, and SES explained over half of the variance in phonological and verbal performance. The results demonstrate a linear association between cerebral organization and phonological skill within socioeconomic groups. These data provide concrete evidence to support the commonly held assumption that both environmental and biological factors are independent determinants of a child's ability to process linguistic information.  相似文献   
976.
977.
978.
In 1990, the Republican Scientific-Medical Library (RSML) of the Ministry of Health of Armenia in collaboration with the Fund for Armenian Relief created a vision of a national library network supported by information technology. This vision incorporated four goals: (1) to develop a national resource collection of biomedical literature accessible to all health professionals, (2) to develop a national network for access to bibliographic information, (3) to develop a systematic mechanism for sharing resources, and (4) to develop a national network of health sciences libraries. During the last decade, the RSML has achieved significant progress toward all four goals and has realized its vision of becoming a fully functional national library. The RSML now provides access to the literature of the health sciences including access to the Armenian medical literature, provides education and training to health professionals and health sciences librarians, and manages a national network of libraries of the major health care institutions in Armenia. The RSML is now able to provide rapid access to the biomedical literature and train health professionals and health sciences librarians in Armenia in information system use. This paper describes the evolution of the RSML and how it was accomplished.  相似文献   
979.
980.
Selecting resources for physician assistants is challenging and can be overwhelming. Although several core lists exist for nursing, allied health, and medical libraries, judging the scope and level of these resources in relation to the information needs of the physician assistant is difficult. Medical texts can be highly specialized and very expensive, in essence, "overkill" for the needs of the physician assistant. This bibliography is meant to serve as a guide to appropriate medical texts for physician assistants. Titles were selected from the Brandon/Hill list, Doody's Electronic Journal, and various other reference resources. Resources were evaluated based on the subject and scope, audience, authorship, cost, and currency. The collection includes 195 titles from 33 specialty areas. Standard texts in each area are also included.  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