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   38684篇
  免费   172篇
  国内免费   130篇
教育   27591篇
科学研究   4479篇
各国文化   233篇
体育   2605篇
综合类   17篇
文化理论   571篇
信息传播   3490篇
  2021年   253篇
  2020年   434篇
  2019年   594篇
  2018年   2765篇
  2017年   2626篇
  2016年   2202篇
  2015年   572篇
  2014年   710篇
  2013年   4825篇
  2012年   761篇
  2011年   1258篇
  2010年   1276篇
  2009年   839篇
  2008年   1098篇
  2007年   1579篇
  2006年   542篇
  2005年   812篇
  2004年   862篇
  2003年   770篇
  2002年   521篇
  2001年   646篇
  2000年   537篇
  1999年   480篇
  1998年   249篇
  1997年   292篇
  1996年   300篇
  1995年   274篇
  1994年   261篇
  1993年   236篇
  1992年   370篇
  1991年   385篇
  1990年   394篇
  1989年   433篇
  1988年   355篇
  1987年   364篇
  1986年   362篇
  1985年   431篇
  1984年   362篇
  1983年   341篇
  1982年   291篇
  1981年   277篇
  1980年   260篇
  1979年   382篇
  1978年   302篇
  1977年   281篇
  1976年   235篇
  1975年   228篇
  1974年   239篇
  1973年   232篇
  1971年   199篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
102.
    
ABSTRACT:  Food companies and supporting industries need inexpensive, revisable training methods for large numbers of hourly employees due to continuing improvements in Hazard Analysis Critical Control Point (HACCP) programs, new processing equipment, and high employee turnover. HACCP-based food safety programs have demonstrated their value by reducing the number and frequency of multimillion-dollar food recalls. The focus for the future must be proactive training of plant personnel to ensure continuous improvements in plant food safety and quality. In response to this need, we developed training modules focused on applying HACCP principles, quality aspects, and production information to individual poultry unit operations. Learning objectives were evaluated using discount usability testing techniques to optimize the delivery system and to ensure a satisfactory e-learning experience. Discount usability testing of this virtual orientation was successful in obtaining vast amounts of feedback. Usability issues with the training materials were identified. Expected completion times were not met by most participants, indicating that a change in the format of the course might be necessary, perhaps segmenting the modules into smaller sections to be reviewed independently of one another. Another suggestion by the evaluators was to include narration for the sections, which might in turn speed up the completion times. A navigation error was discovered by these users, as well as other critical errors in design. Other errors, such as font inconsistencies and page design changes, were also discovered by the participants.  相似文献   
103.
Challenged by the national residency registration system in China, migrant children have always faced obstacles in accessing public education. Recent policy changes, however, have brought hope for these children. This article introduces some international concerns regarding migrant children and provides a close view of Chinese perspectives. Issues relating to access to public education and recommendations for policies and practices are also discussed.  相似文献   
104.
Correlations of WPPSI IQs with concurrently administered subtests from the WRAT were compared with analogous WISC-R/WRAT correlations in a group of children referred by regular classroom teachers for school psychological services. Although the magnitudes of all correlations were reduced, due to restriction of range, the comparisons indicated no significant differences in the magnitudes of the correlations of the WPPSI and the WISC-R with the WRAT. These results support the use of the two instruments as equivalent predictors of achievement.  相似文献   
105.
106.
In four Pavlovian conditioned lick-suppression experiments, rats had two conditioned stimuli (CSs X and A) independently paired with footshock, followed by pairings of a compound of A and X with the footshock. On subsequent tests with CS X, less conditioned suppression was observed than in control subjects that lacked the compound AX→footshock trials. Thisoverexpectation effect was reversed through posttraining extinction of CS A, a result consistent with both performance- and acquisition-focused models of retrospective revaluation. However, only performance-focused models could account for how posttraining increases or decreases in the A-footshock temporal interval attenuate the overexpectation effect.  相似文献   
107.
The article examines the theory and practice of focus groups in adult education research. Three theoretical positions are described: radical hermeneutic, moderate interpretative and pragmatic realistic position trying to bridge the gap with positivist research. This last position has been chosen as the departure point for a further analysis of the focus group elements, which relate to validity and reliability. The research examines four European research projects in the field of adult education. The most important and surprising data are presented with reference to both socio-psychological and technical problems in the use of this method. The results highlight the importance and dynamics of all the elements discussed.  相似文献   
108.
109.
This forum response extends the argument made by Avery and Hains that oral traditions can be useful for including the cultures and contexts of rural areas within science instruction. To buttress the oral expressions presented in Avery and Hains, I compare oral expressions of a second rural area, 600 miles to the South, in Eastern North Carolina. I explore similarities and differences in expressions from the two areas and consider the changing rural context within Eastern North Carolina. I add a consideration of larger demographic shifts impacting many rural areas—particularly in the US South—and close with a discussion of implications for science education.  相似文献   
110.
Science smiles     
  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