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   25992篇
  免费   377篇
  国内免费   18篇
教育   18538篇
科学研究   2703篇
各国文化   189篇
体育   1957篇
综合类   23篇
文化理论   237篇
信息传播   2740篇
  2021年   228篇
  2020年   342篇
  2019年   497篇
  2018年   724篇
  2017年   738篇
  2016年   682篇
  2015年   429篇
  2014年   613篇
  2013年   4604篇
  2012年   593篇
  2011年   640篇
  2010年   501篇
  2009年   451篇
  2008年   576篇
  2007年   493篇
  2006年   549篇
  2005年   405篇
  2004年   425篇
  2003年   381篇
  2002年   433篇
  2001年   589篇
  2000年   568篇
  1999年   475篇
  1998年   252篇
  1997年   321篇
  1996年   333篇
  1995年   278篇
  1994年   250篇
  1993年   264篇
  1992年   403篇
  1991年   363篇
  1990年   388篇
  1989年   418篇
  1988年   395篇
  1987年   371篇
  1986年   352篇
  1985年   397篇
  1984年   320篇
  1983年   342篇
  1982年   281篇
  1981年   256篇
  1980年   258篇
  1979年   383篇
  1978年   297篇
  1977年   259篇
  1976年   228篇
  1975年   212篇
  1974年   207篇
  1973年   201篇
  1971年   182篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
Three supervision modalities (live, delayed review, and verbal reports) in training marital and family counselors are discussed with attention given to goals, supervisory considerations, advantages, and disadvantages of each modality.  相似文献   
42.
43.
44.
45.
46.
47.
48.
49.
This investigation was undertaken in an effort to establish physiological characteristics of soccer players and to relate them to positional roles. A total of 135 footballers (age 24.4 +/- 4.6 years) were assessed for body mass, % body fat, haemoglobin, maximal oxygen uptake (VO2 max), leg power, anaerobic capacity and speed prior to an English league season. The sample included 13 goalkeepers, 22 full-backs, 24 centre-backs, 35 midfield players and 41 forwards. The goalkeepers were significantly heavier (86.1 +/- 5.5 kg; P < 0.01) than all groups except the centre-backs, had significantly higher estimated body fat percentages than centre-backs, forwards, midfield players (P < 0.01) or full-backs (P < 0.05), significantly lower estimated VO2 max values (56.4 +/- 3.9 ml kg-1 min-1; P < 0.01) and were slowest over 60 m (12.71 +/- 0.42 s). The midfield players had the highest predicted VO2 max values (61.4 +/- 3.4 ml kg-1 min-1), this being significantly greater (P < 0.05) than for the centre-backs. The forwards were the fastest group over 60 m (12.19 +/- 0.30 s), being significantly quicker than goalkeepers or centre-backs (P < 0.01) and full-backs (P < 0.05). Anaerobic power, as well as knee extensor torques (corrected for body mass) and extensor-flexor ratios, were similar between groups. No difference in estimated body fat percentage was observed between any of the outfield players, and haemoglobin concentrations were similar among players of all positions.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
50.
The roles of academic health sciences librarians are continually evolving as librarians initiate new programs and services in response to developments in computer technology and user demands. However, statistics currently collected by libraries do not accurately reflect or measure these new roles. It is essential for librarians to document, measure, and evaluate these new activities to continue to meet the needs of users and to ensure the viability of their professional role. To determine what new measures should be compiled, the authors examined current statistics, user demands, professional literature, and current activities of librarians as reported in abstracts of poster sessions at Medical Library Association annual meetings. Three new categories of services to be measured are proposed. The first, consultation, groups activities such as quality filtering and individual point-of-need instruction. The second, outreach, includes activities such as working as liaisons, participating in grand rounds or morning report, and providing continuing education. The third area, Web authoring, encompasses activities such as designing Web pages, creating online tutorials, and developing new products. Adding these three measures to those already being collected will provide a more accurate and complete depiction of the services offered by academic health sciences librarians.  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