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   10596篇
  免费   131篇
  国内免费   18篇
教育   7275篇
科学研究   1084篇
各国文化   94篇
体育   1177篇
综合类   6篇
文化理论   131篇
信息传播   978篇
  2022年   73篇
  2021年   97篇
  2020年   161篇
  2019年   272篇
  2018年   356篇
  2017年   354篇
  2016年   334篇
  2015年   205篇
  2014年   279篇
  2013年   1945篇
  2012年   233篇
  2011年   226篇
  2010年   207篇
  2009年   184篇
  2008年   193篇
  2007年   213篇
  2006年   179篇
  2005年   158篇
  2004年   155篇
  2003年   183篇
  2002年   154篇
  2001年   173篇
  2000年   165篇
  1999年   163篇
  1998年   83篇
  1997年   86篇
  1996年   117篇
  1995年   86篇
  1994年   107篇
  1993年   94篇
  1992年   162篇
  1991年   152篇
  1990年   144篇
  1989年   143篇
  1988年   118篇
  1987年   121篇
  1986年   141篇
  1985年   145篇
  1984年   119篇
  1983年   131篇
  1982年   117篇
  1981年   107篇
  1980年   97篇
  1979年   171篇
  1978年   117篇
  1977年   109篇
  1976年   105篇
  1975年   81篇
  1974年   93篇
  1972年   72篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
This article describes a set of computerized tools that support the design and evaluation of competency-based training programs. The training of complex skills such as air traffic control and process control requires a competency-based approach that focuses on the integration and coordination of constituent skills and transfer of learning. At the heart of the training are authentic whole-task practice situations. The instructional design tools are based on van Merriënboer's 4C/ID* methodology (1997). The article describes a training design tool (Core) that supports the analysis and design for competency-based training programs and an evaluation tool (Eval) that supports the subsequent revision of this training design.  相似文献   
132.
133.
Classroom     
  相似文献   
134.
135.
Instructors can use both “multiple‐choice” (MC) and “constructed response” (CR) questions (such as short answer, essay, or problem‐solving questions) to evaluate student understanding of course materials and principles. This article begins by discussing the advantages and concerns of using these alternate test formats and reviews the studies conducted to test the hypothesis (or perhaps better described as the hope) that MC tests, by themselves, perform an adequate job of evaluating student understanding of course materials. Despite research from educational psychology demonstrating the potential for MC tests to measure the same levels of student mastery as CR tests, recent studies in specific educational domains find imperfect relationships between these two performance measures. We suggest that a significant confound in prior experiments has been the treatment of MC questions as homogeneous entities when in fact MC questions may test widely varying levels of student understanding. The primary contribution of the article is a modified research model for CR/MC research based on knowledge‐level analyses of MC test banks and CR question sets from basic computer language programming. The analyses are based on an operationalization of Bloom's Taxonomy of Learning Goals for the domain, which is used to develop a skills‐focused taxonomy of MC questions. However, we propose that their analyses readily generalize to similar teaching domains of interest to decision sciences educators such as modeling and simulation programming.  相似文献   
136.
Adults are typically required to make values‐based decisions multiple times each day.Why, then, should a discussion of values not be explicit across the college curriculum and intentionally integrated into the cocurriculum? The authors describe a place where the work of values education is widely shared.  相似文献   
137.
ABSTRACT:  The purpose of this study was to use a validated instrument to determine the attitudes and knowledge of high school teachers regarding food irradiation, and to determine the correlations among their knowledge and attitudes and certain demographic variables. Knowledge and attitudes about food irradiation were measured in selected high school family and consumer sciences teachers ( n = 121) who taught Food and Nutrition, Food Science and Technology, and/or Food Production Management and Services, via a 24-item instrument with 6 factors. Results revealed these teachers held neutral to positive attitudes about the safety of irradiated foods, their perception of the risk of foodborne illness, and learning about food irradiation, and neutral to negative perceptions of their understanding of food irradiation and their competence to teach about it. These teachers had a moderate knowledge base regarding food irradiation. Teachers' attitudes regarding the safety of food irradiation were positively correlated with their perceived understanding of food irradiation, actual knowledge of it, and competence to teach about it. Their perceived understanding of food irradiation was positively correlated with competence to teach about it, knowledge, and attitudes toward the safety of food irradiation. The only demographic variable correlated with knowledge or attitudes was teachers' previous food irradiation educational experiences. These data suggest the importance of education for family and consumer sciences teachers concerning food irradiation.  相似文献   
138.
Echolocation     
G. Marimuthu 《Resonance》1996,1(5):40-48
Bats are capable of avoiding obstacles that they encounter, even in complete darkness. This is because they emit ultrasound (high frequency sound) and analyse the echo produced when the sound hits objects on their path. This article describes the hunting flight of bats and how echolocation is useful in prey capture. Prey capture without the aid of echolocation by some bats is also described.  相似文献   
139.
140.
INTRODUCTION The world population of buffaloes(Bubalus bubalis)has been estimated at over172million head,more than97%(167.6million)of which are in Asia and the Pacific region,mainly in India(97.7million)and Pakistan(25.5million)(FAO,2004).About98%of buffaloes in the region are raised by small farmers owning less than two hectares of land and less than five buffaloes(Mudgal,1992).In general,the water buffalo is regarded as more productive,healthier and more useful than the cow,especiall…  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