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   12409篇
  免费   87篇
  国内免费   125篇
教育   8016篇
科学研究   1352篇
各国文化   125篇
体育   1911篇
综合类   19篇
文化理论   95篇
信息传播   1103篇
  2022年   81篇
  2021年   117篇
  2020年   244篇
  2019年   325篇
  2018年   395篇
  2017年   389篇
  2016年   402篇
  2015年   283篇
  2014年   329篇
  2013年   2014篇
  2012年   281篇
  2011年   295篇
  2010年   240篇
  2009年   266篇
  2008年   259篇
  2007年   230篇
  2006年   245篇
  2005年   201篇
  2004年   408篇
  2003年   395篇
  2002年   356篇
  2001年   426篇
  2000年   256篇
  1999年   183篇
  1998年   126篇
  1997年   114篇
  1996年   109篇
  1995年   123篇
  1994年   120篇
  1993年   91篇
  1992年   168篇
  1991年   139篇
  1990年   150篇
  1989年   161篇
  1988年   124篇
  1987年   138篇
  1986年   127篇
  1985年   145篇
  1984年   132篇
  1983年   130篇
  1982年   103篇
  1981年   98篇
  1980年   94篇
  1979年   144篇
  1978年   101篇
  1977年   80篇
  1976年   92篇
  1975年   69篇
  1974年   80篇
  1971年   69篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Continuous observation of the physical activity of 56 preadolescent children was conducted in four regions of England from October 1988 to July 1989. Observations were undertaken during school break times, lunch times, and physical education lessons, as well as during the children's free time. Of total time observed, the children spent 32.4% of it engaged in moderate to vigorous physical activity (MVPA). Children were shown to be most active during school breaks and least active during free time at home. However, it is thought that cardiorespiratory benefits are best achieved by participation in sustained periods of MVPA. Only 8 (14%) of the 56 children were observed to participate in MVPA for sustained periods of 20 min or longer. A random sample of 55 physical education lessons was observed. Only 6 children engaged in MVPA for sustained periods of 5 min or more, and no children participated in MVPA for 10 min or longer. The implications of these results are that, although the children engaged in a reasonable amount of MVPA, it may not have been sustained for periods of sufficient length to produce a cardiovascular training response. Consideration is given to ways of promoting lifelong involvement in physical activity.  相似文献   
2.
The goal of the Standards for Educational and Psychological Testing is to improve testing practices, but their impact on practice appears spotty. Self-regulation clearly fails in some instances. The establishment of an external agency to oversee testing practices and adherence to the Standards would face substantial hurdles, and the ambiguity of many of the Standards would hobble such an organization if one were created. Many of the Standards are general statements of principle, and past controversies make clear that we in the field often disagree about the reasons for them, their applicability to specific cases, and their practical meaning in specific contexts. This paper argues that the field should follow two approaches to lessen this ambiguity. First, using journals, conferences, and other vehicles, we should foster more frequent and more protracted debate about the practical meaning of key Standards, such as 13.6 and 13.7, which mandate that a decision that will have a "major impact" on a student should not be based on a single score. Second, future revisions of the Standards should use concrete examples of testing practices to clarify the meaning of the Standards, much as the legal system uses case law to clarify the meaning of the general principles embodied in statutes .  相似文献   
3.
4.
The aim was to examine cross-cultural variation in linguistic responsiveness to young children in 10 English-speaking mother–child dyads and 10 Italian-speaking mother– child dyads. All 20 children were late talkers who possessed delays in expressive vocabulary development but age-appropriate cognitive and receptive language skills. Dyads were filmed in 15 minute free play contexts, which were transcribed and coded for measures of maternal linguistic input (e.g. rate, MLU, labels, expansions) and child language productivity (e.g. utterances, different words used). The results revealed that the Italian mothers used more utterances, spoke more quickly and used a more diverse vocabulary than the Canadian mothers. The Italian children mirrored their mothers and also used more utterances and a more diverse vocabulary than the Canadian children. Mothers in both groups used similar percentages of responsive labels and expansions. However, Italian mothers responded to fewer of their children's vocalisations, using a smaller percentage of imitations and interpretations than the Canadian mothers. Correlations between maternal input and children's language productivity revealed that contingent language measures (e.g. imitations, interpretations, expansions) were related to high levels of productivity in children in both cultural groups. The results support the use of language interventions based on increasing maternal responsiveness for these children at the one-word stage of language development. They also point to differences that may be culturally based. For example, Italian mothers use faster rates of interaction and appear to have higher expectations for their children's verbal participation in interaction. This is reflected in higher rates of language production from their children, even though children in both cultural groups have similar vocabulary sizes.  相似文献   
5.
The emerging political consciousness of the Russian people isanalyzed against a background of severe constraints in the Sovietera on public opinion formation. Problems in the transitionto democracy and representative government are reflected inheightened interest in politics, volatile levels of confidencein key political institutions, and deep uncertainty about thefuture in both economic and political terms.  相似文献   
6.
7.
To understand spoken words, listeners must appropriately interpret co‐occurring talker characteristics and speech sound content. This ability was tested in 6‐ to 14‐months‐olds by measuring their looking to named food and body part images. In the new talker condition (n = 90), pictures were named by an unfamiliar voice; in the mispronunciation condition (n = 98), infants’ mothers “mispronounced” the words (e.g., nazz for nose). Six‐ to 7‐month‐olds fixated target images above chance across conditions, understanding novel talkers, and mothers’ phonologically deviant speech equally. Eleven‐ to 14‐months‐olds also understood new talkers, but performed poorly with mispronounced speech, indicating sensitivity to phonological deviation. Between these ages, performance was mixed. These findings highlight the changing roles of acoustic and phonetic variability in early word comprehension, as infants learn which variations alter meaning.  相似文献   
8.
9.
10.
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