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   27559篇
  免费   443篇
  国内免费   36篇
教育   19960篇
科学研究   2309篇
各国文化   311篇
体育   2021篇
综合类   37篇
文化理论   239篇
信息传播   3161篇
  2021年   258篇
  2020年   413篇
  2019年   580篇
  2018年   789篇
  2017年   916篇
  2016年   830篇
  2015年   512篇
  2014年   670篇
  2013年   5536篇
  2012年   663篇
  2011年   717篇
  2010年   572篇
  2009年   556篇
  2008年   634篇
  2007年   605篇
  2006年   536篇
  2005年   487篇
  2004年   463篇
  2003年   422篇
  2002年   457篇
  2001年   479篇
  2000年   461篇
  1999年   458篇
  1998年   265篇
  1997年   289篇
  1996年   317篇
  1995年   270篇
  1994年   279篇
  1993年   252篇
  1992年   359篇
  1991年   364篇
  1990年   392篇
  1989年   380篇
  1988年   350篇
  1987年   303篇
  1986年   316篇
  1985年   372篇
  1984年   320篇
  1983年   331篇
  1982年   251篇
  1981年   261篇
  1980年   231篇
  1979年   296篇
  1978年   288篇
  1977年   247篇
  1976年   206篇
  1975年   177篇
  1974年   151篇
  1973年   186篇
  1972年   149篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
51.
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   
52.
53.
54.
PUBLIC AND ELITE ATTITUDES TO ENVIRONMENTAL ISSUES   总被引:1,自引:0,他引:1  
This paper puts the environment into perspective. Politiciansand commentators see the environment as yesterday's issue, forgettingthat the core of environmental activists is still double thelevel of just five years ago. International comparisons stretchingfrom Poland to New Zealand are made, examining the public'senvironmental behavior, attitudes and values. Using Great Britainas a case study, detailed comparisons are made between the attitudesof the general public with journalists, the financial community,captains of industry, and Members of Parliament and the latterthen compared with Members of the European Parliament. The publicis demanding action by companies and by governments on environmentalissues and has little faith in either to take corrective action.  相似文献   
55.
56.
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   
57.
58.
59.
60.
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