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   51016篇
  免费   1877篇
  国内免费   13篇
  2019年   574篇
  2018年   797篇
  2017年   711篇
  2016年   823篇
  2015年   591篇
  2014年   761篇
  2013年   4614篇
  2012年   1279篇
  2011年   1380篇
  2010年   862篇
  2009年   873篇
  2008年   1241篇
  2007年   1196篇
  2006年   1115篇
  2005年   932篇
  2004年   944篇
  2003年   934篇
  2002年   904篇
  2001年   1552篇
  2000年   1553篇
  1999年   1163篇
  1998年   573篇
  1996年   641篇
  1995年   609篇
  1994年   588篇
  1993年   558篇
  1992年   1141篇
  1991年   1044篇
  1990年   1046篇
  1989年   930篇
  1988年   941篇
  1987年   890篇
  1986年   902篇
  1985年   904篇
  1984年   771篇
  1983年   680篇
  1982年   542篇
  1981年   538篇
  1979年   790篇
  1978年   624篇
  1975年   719篇
  1974年   742篇
  1973年   812篇
  1972年   756篇
  1971年   683篇
  1970年   586篇
  1969年   588篇
  1968年   755篇
  1967年   656篇
  1966年   624篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
42.
43.
44.
45.
Gay marriages (as such) are not as yet allowed anywhere but the demand for them is increasing. Most countries take a liberal attitude towards marriage: few obstacles are put in its way. But objections to gay marriages continue to be raised. These objections are refuted and the case for gay marriage is assessed through the prism of various forms of liberalism. The normative argument for allowing gay marriage is shown to be both strong and consistent with many of the values upheld by the opponents of such unions.  相似文献   
46.
47.
The authors used recursive partitioning methods to identify combinations of baseline characteristics that predict 2-year physical activity success in each of 3 physical activity interventions delivered in the multisite Activity Counseling Trial. The sample consisted of 874 initially sedentary primary care patients, ages 35-75 years, who were at risk for cardiovascular disease. Predictors of 2-year success were specific to each intervention and represented a range of domains, including physiological, demographic, psychosocial, health-related, and environmental variables. The results indicate how specific patient subgroups (e.g., obese, unfit individuals; high-income individuals in stable health) may respond differently to varying levels and amounts of professional assistance and support. The methods used provide a practical first step toward identifying clinically meaningful patient subgroups for further systematic investigation.  相似文献   
48.
49.
50.
Human communication is thoroughly context bound. We present two experiments investigating the importance of the shared context, that is, the amount of knowledge two interlocutors have in common, for the successful emergence and use of novel conventions. Using a referential communication task where black‐and‐white pictorial symbols are used to convey colors, pairs of participants build shared conventions peculiar to their dyad without experimenter feedback, relying purely on ostensive‐inferential communication. Both experiments demonstrate that access to the visual context promotes more successful communication. Importantly, success improves cumulatively, supporting the view that pairs establish conventional ways of using the symbols to communicate. Furthermore, Experiment 2 suggests that dyads with access to the visual context successfully adapt the conventions built for one color space to another color space, unlike dyads lacking it. In linking experimental pragmatics with language evolution, the study illustrates the benefits of exploring the emergence of linguistic conventions using an ostensive‐inferential model of communication.  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