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   32236篇
  免费   468篇
  国内免费   42篇
教育   22410篇
科学研究   3883篇
各国文化   279篇
体育   2352篇
综合类   38篇
文化理论   246篇
信息传播   3538篇
  2021年   306篇
  2020年   484篇
  2019年   681篇
  2018年   936篇
  2017年   991篇
  2016年   893篇
  2015年   559篇
  2014年   745篇
  2013年   5986篇
  2012年   758篇
  2011年   796篇
  2010年   635篇
  2009年   599篇
  2008年   661篇
  2007年   660篇
  2006年   560篇
  2005年   512篇
  2004年   475篇
  2003年   440篇
  2002年   488篇
  2001年   561篇
  2000年   546篇
  1999年   524篇
  1998年   281篇
  1997年   304篇
  1996年   352篇
  1995年   279篇
  1994年   296篇
  1993年   279篇
  1992年   417篇
  1991年   424篇
  1990年   453篇
  1989年   457篇
  1988年   401篇
  1987年   351篇
  1986年   389篇
  1985年   448篇
  1984年   378篇
  1983年   360篇
  1982年   300篇
  1981年   287篇
  1980年   275篇
  1979年   369篇
  1978年   325篇
  1977年   287篇
  1976年   249篇
  1975年   195篇
  1974年   218篇
  1973年   228篇
  1971年   205篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
61.
This study was designed to examine the magnitude and duration of excess postexercise oxygen consumption (EPOC) following upper body exercise, using lower body exercise for comparison. On separate days and in a counterbalanced order, eight subjects (four male and four female) performed a 20-min exercise at 60% of mode-specific peak oxygen uptake (VO2) using an arm crank and cycle ergometer. Prior to each exercise, baseline VO2 and heart rate (HR) were measured during the final 15 min of a 45-min seated rest. VO2 and HR were measured continuously during the postexercise period until baseline VO2 was reestablished. No significant difference between the two experimental conditions was found for magnitude of EPOC (t [7] = 0.69, p greater than .05). Mean (+/- SD) values were 9.2 +/- 3.3 and 10.4 +/- 5.8 kcal for the arm crank and cycle ergometer exercises, respectively. Duration of EPOC was relatively short and not significantly different (t [7] = 0.24, p greater than .05) between the upper body (22.9 +/- 13.7 min) and lower body (24.2 +/- 19.4 min) exercises. Within the framework of the chosen exercise conditions, these results suggest EPOC may be related primarily to the relative metabolic rate of the active musculature, as opposed to the absolute exercise VO2 or quantity of active muscle mass associated with these two types of exercise.  相似文献   
62.
63.
64.
65.
66.
67.
The many challenges faced by health sciences libraries of all types and sizes often require innovative solutions. When an innovative solution involves calculated risk taking, the approach is called intrapreneurial. At the University of Miami School of Medicine, an intrapreneurial approach solved the fiscal problems of the biomedical communications unit. The Louis Calder Memorial Library inherited these problems when the Department of the Library and Biomedical Communications was created in the early 1980s. In this paper, two intrapreneurial programs are described, and the benefit and suitability of this management style to information services are demonstrated.  相似文献   
68.
69.
The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest.  相似文献   
70.
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