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   25532篇
  免费   396篇
  国内免费   15篇
教育   18217篇
科学研究   2430篇
各国文化   218篇
体育   1963篇
综合类   13篇
文化理论   272篇
信息传播   2830篇
  2022年   157篇
  2021年   260篇
  2020年   382篇
  2019年   606篇
  2018年   1387篇
  2017年   1376篇
  2016年   1101篇
  2015年   462篇
  2014年   668篇
  2013年   4434篇
  2012年   704篇
  2011年   900篇
  2010年   726篇
  2009年   616篇
  2008年   714篇
  2007年   753篇
  2006年   427篇
  2005年   482篇
  2004年   493篇
  2003年   433篇
  2002年   367篇
  2001年   477篇
  2000年   409篇
  1999年   359篇
  1998年   203篇
  1997年   219篇
  1996年   240篇
  1995年   235篇
  1994年   181篇
  1993年   200篇
  1992年   321篇
  1991年   280篇
  1990年   284篇
  1989年   278篇
  1988年   239篇
  1987年   285篇
  1986年   252篇
  1985年   290篇
  1984年   235篇
  1983年   198篇
  1982年   173篇
  1981年   155篇
  1980年   134篇
  1979年   241篇
  1978年   173篇
  1977年   152篇
  1976年   138篇
  1975年   130篇
  1974年   133篇
  1971年   119篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Transcribing sign communication used simultaneously with spoken English presents investigators with a unique problem: the singular quality of the bimodal communicative interactions cannot be accurately depicted using accepted conventions for recording either spoken or signed language samples. This article proposes guidelines for transcribing such data. The need for guidelines arose during an earlier study of the language development of a hearing child of deaf parents. To meet the immediate needs of that study, rules and conventions from previous studies were combined with newly generated ones, resulting in the guidelines proposed in this article. The guidelines can be applied to data in which intermodal linguistic influence is suspected.  相似文献   
23.
24.
Human generated environmental problems are significant issues of global concern. Despite this, varying attitudes towards environments continue to exist across the globe, impacting on environmental decision-making and action at local, national and international levels. This paper probes some of the similarities and differences in environmental attitudes amongst pre-service teachers in Australia, Republic of Maldives and Indonesia. Data were collected using an established environmental attitude questionnaire and individual interviews. The three communities exhibited a similar range of environmental attitudes using the established questionnaire but significant differences emerged when the interview data were analysed phenomenographically. These differences reflect diversity within and across cultural groups that cannot be satisfactorily explained by the theory underpinning the established questionnaire. Consequently, a revised conceptual framework is proposed.  相似文献   
25.
How accurate is the reported percent of students’reaching standards at the school level? How are standard errors for these statistics computed? How do estimates vary with choice of generalizability model?  相似文献   
26.
In recent years university presses have undergone some significant changes, such as expansion of their scope to include materials that may have appeal beyond the scholarly market. This article investigates, through the use of a survey of university libraries, the acquisition of university press products by libraries. In general, recent years have been changes in the relationship between university presses and libraries that have resulted in fewer items being purchased by the libraries.  相似文献   
27.
28.
29.
30.
A completely general three-dimensional dynamic model is presented for the motion of basketball shots that may contact the rim, the backboard, the bridge between the rim and board, and possibly the board and the bridge simultaneously. Non-linear ordinary differential equations with six degrees of freedom describe the ball angular velocity and ball centre position. The model includes radial ball compliance and damping and contains five sub-models: purely gravitational flight, and ball-rim, ball-bridge, ball-board, and ball-bridge-board contact. Each contact sub-model has both slipping and non-slipping motions. Switching between the sub-models depends on the reaction force at, and velocity of, the contact point. Although the model can be used to study shots from any point on the court, we here use it to study the sets of free throw release angle, velocity, angular velocity, and lateral deviation angle that result in success (capture), as well as underhand free throws and those using an under-inflated ball. Free throw shots with larger backspin, lower inflation pressures, and underhand release conditions are shown to result in larger capture percentages.  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