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   22787篇
  免费   361篇
  国内免费   30篇
教育   16415篇
科学研究   2001篇
各国文化   206篇
体育   1727篇
综合类   34篇
文化理论   190篇
信息传播   2605篇
  2022年   135篇
  2021年   230篇
  2020年   369篇
  2019年   500篇
  2018年   707篇
  2017年   783篇
  2016年   721篇
  2015年   434篇
  2014年   577篇
  2013年   4319篇
  2012年   573篇
  2011年   641篇
  2010年   489篇
  2009年   460篇
  2008年   525篇
  2007年   511篇
  2006年   450篇
  2005年   395篇
  2004年   374篇
  2003年   332篇
  2002年   383篇
  2001年   426篇
  2000年   400篇
  1999年   403篇
  1998年   211篇
  1997年   234篇
  1996年   258篇
  1995年   217篇
  1994年   214篇
  1993年   194篇
  1992年   304篇
  1991年   308篇
  1990年   331篇
  1989年   317篇
  1988年   296篇
  1987年   250篇
  1986年   258篇
  1985年   325篇
  1984年   268篇
  1983年   257篇
  1982年   198篇
  1981年   207篇
  1980年   178篇
  1979年   243篇
  1978年   217篇
  1977年   197篇
  1976年   162篇
  1975年   129篇
  1974年   120篇
  1973年   148篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
A training program of paraprofessionals was developed in a university teaching hospital. Trainees were exposed to seminars and a supervised practicum. The objectives of the experience included sensitization of persons in the natural helping network to (a) psychosocial needs of seriously ill persons and their families, (b) experience and comfort in interaction with such persons; (c) the structure of the health care delivery system, and (d) the usefulness of peer support groups.  相似文献   
982.
983.
984.
985.
986.
987.
In three experiments, rats received pairings of flavor conditioned stimuli with polycose unconditioned stimuli, in either a simultaneous or a sequential relation. Both temporal relations produced excellent conditioned increases in consumption of the flavors. Separate presentation of the flavors resulted in extinction in both cases. However, restoring the pairing of the flavor with polycose resulted in reconditioning only with the sequential, not with the simultaneous, relation.  相似文献   
988.
989.
Coaches, sport scientists and researchers assess rowing performance on-water and on a variety of ergometers. Ergometers are frequently used because of the easier assessment environment. However, there is limited information on the ability of rowers to reproduce mean power or time-trial time when using different rowing ergometers (Concept II and RowPerfect) or completing tests over different distances (500 m versus 2000 m races). To test the efficacy of an intervention on a rower's ability to produce power, or to monitor that ability, it is essential to determine a reliable rowing performance test. The per cent standard error of measurement in performance (assessed by mean power and time-trial time) of fifteen national standard rowers was determined for five repeated 500 m and two repeated 2000 m races on a Concept II and RowPerfect ergometer. The per cent standard error of measurement (% SEM) in mean power between 5x500m races, regardless of gender, was 2.8% (95% confidence limits (CL)=2.3 to 3.4%) for the Concept II ergometer and 3.3% (95% CL=2.5 to 3.9%) for the RowPerfect ergometer (n = 15). Over 2000 m the per cent standard error of measurement in mean power was 1.3% (95% CL 0.9 to 2.9%) for the Concept II ergometer and 3.3% (95% CL 2.2 to 7.0%) for the RowPerfect ergometer The results highlight an increase in per cent standard error of the mean during performance races of less than 2000m on the Concept II ergometer, and performance races on the RowPerfect ergometer compared with the Concept II ergometer over 500 m and 2000 m. The most appropriate protocol for testing the influence of an intervention on the ability of a rower to produce power would be 2000 m races on a Concept II ergometer.  相似文献   
990.
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