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   24187篇
  免费   431篇
  国内免费   15篇
教育   17381篇
科学研究   2056篇
各国文化   254篇
体育   1959篇
综合类   14篇
文化理论   179篇
信息传播   2790篇
  2022年   175篇
  2021年   274篇
  2020年   402篇
  2019年   647篇
  2018年   877篇
  2017年   869篇
  2016年   750篇
  2015年   458篇
  2014年   703篇
  2013年   4797篇
  2012年   673篇
  2011年   675篇
  2010年   511篇
  2009年   520篇
  2008年   585篇
  2007年   517篇
  2006年   450篇
  2005年   439篇
  2004年   406篇
  2003年   383篇
  2002年   363篇
  2001年   495篇
  2000年   413篇
  1999年   376篇
  1998年   215篇
  1997年   229篇
  1996年   253篇
  1995年   252篇
  1994年   196篇
  1993年   216篇
  1992年   329篇
  1991年   317篇
  1990年   312篇
  1989年   309篇
  1988年   263篇
  1987年   306篇
  1986年   275篇
  1985年   313篇
  1984年   266篇
  1983年   222篇
  1982年   205篇
  1981年   175篇
  1980年   163篇
  1979年   266篇
  1978年   188篇
  1977年   177篇
  1976年   163篇
  1975年   149篇
  1974年   161篇
  1973年   135篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The study was designed to determine whether outer-directedness, measured by glances at E during object assembly tasks administered according to the Turnure and Zigler (1964) procedure, predicts changes in preschoolers' Binet IQs over 6 months. With MA as a covariate to control for the small but significant relationship betweeen glances and developmental level, an ANOCOVA showed a significant interaction resulting from increases in the IQs of non-outer-directed Ss and declines in the IQs of outer-directed Ss. Glances at E's puzzle while S assembled his own were unrelated to glances at E or to IQ changes, but, unlike glances at E, were significantly related to improvements in performance from puzzle 1 to puzzle 2.  相似文献   
993.
994.
995.
996.
A report is given on Canadian hospital library standards as recently developed and incorporated in a new Guide to Hospital Accreditation, 1977. The new Canadian standards are compared with MLA recommendations to the Joint Commission on Accreditation of Hospitals. Their development is sketched and the contribution from Quebec of a model of hospital classification is examined. This model provides differential minimal library standards based on the function of the hospital rather than on its size alone. Use of these minimal standards as a practical means of developing hospital libraries is discussed and their implications for accreditation visits are underlined.  相似文献   
997.
998.
Michael Farrell, Education Inspector with the London Borough of Hillingdon Education Services, suggests that the term 'mainstream inclusion' should be replaced by 'educational inclusion' in order to avoid the implication that venues other than mainstream schools are inferior. He argues that the placement of pupils with SEN in mainstream schools should be informed by a consideration of the effectiveness of the venue in raising academic and personal and social standards.  相似文献   
999.
The purpose of the present study was to determine the effects of 10-in [0.25-m] versus 16-in [0.41-m] wheelchair handrims on cardiorespiratory and psychophysiological exercise responses during wheelchair propulsion at selected velocities. Fifteen male paraplegics (27.0 +/- 5.5 yrs) performed three discontinuous exercise tests (ACE = arm crank ergometer; WERG = wheelchair roller ergometer) and two 1600-m performance-based track trials (TRACK) under simulated race conditions. There were no significant differences in HR, VO2, VE, HLa, or category-ratio ratings of perceived exertion (RPE) using different handrims during wheelchair propulsion at 4 km.h-1. In contrast, at 8 km.h-1 subjects demonstrated a 13% lower steady state VO2 (p less than .05) using the 10-in handrims, coincident with a 23% lower VE. Steady state HR during WERG at 8 km.h-1 using the 10-in (124.4 +/- 3.9 b.min-1) or 16-in (130.6 +/- 4.6 b.min-1) handrims were not significantly different. There were also no significant differences between ACE or WERG conditions during maximal effort for VO2 or VE. However, HRpeak during ACE was 7% higher than HRpeak during WERG16 (183 +/- 15 b.min-1 vs. 171 +/- 12 b.min-1, p less than .05), and whole blood HLa during ACE was also significantly higher (by 2.3-2.5 mmol; p less than .05) compared to WERG. There were no significant differences for HR, performance time, or RPE between trials using different handrim diameters during the 1600-m event.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
1000.
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