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   7059篇
  免费   281篇
  国内免费   370篇
  2024年   6篇
  2023年   43篇
  2022年   51篇
  2021年   64篇
  2020年   111篇
  2019年   155篇
  2018年   118篇
  2017年   139篇
  2016年   108篇
  2015年   92篇
  2014年   110篇
  2013年   347篇
  2012年   101篇
  2011年   135篇
  2010年   138篇
  2009年   130篇
  2008年   185篇
  2007年   250篇
  2006年   253篇
  2005年   206篇
  2004年   212篇
  2003年   152篇
  2002年   124篇
  2001年   64篇
  2000年   66篇
  1999年   41篇
  1998年   26篇
  1997年   24篇
  1996年   16篇
  1995年   18篇
  1994年   10篇
  1993年   15篇
  1992年   5篇
  1991年   8篇
  1990年   4篇
  1989年   8篇
  1987年   3篇
  1985年   329篇
  1984年   365篇
  1983年   308篇
  1982年   373篇
  1981年   362篇
  1980年   385篇
  1979年   339篇
  1978年   373篇
  1977年   310篇
  1976年   327篇
  1975年   247篇
  1974年   242篇
  1973年   210篇
排序方式: 共有7710条查询结果,搜索用时 15 毫秒
971.
Volunteer chronic alcoholics were given daily access to substantial quantities of alcohol within a residential research setting. Drinking was suppressed to an average of approximately one-half of Baseline levels when 10 or 15 min of physical and social isolation was required as an immediate consequence to receiving each one-ounce drink of 95-proof ethanol. This time-out procedure suppressed the drinking of nine out of ten subjects. Drinking returned to high levels when brief contingent time-out was discontinued. The relevance of such reversible controlling relationships to the treatment of alcoholism is discussed.  相似文献   
972.
973.
974.
975.
Rural economically deprived adolescent males, who had been previously surveyed as high school seniors concerning their post-high school plans, were surveyed again 1 yr later concerning their present occupational status and feelings of personal satisfaction. The Ss had been divided in an earlier study into two groups, low identification males (LIM) and high identification males (HIM) based upon independent evaluators' judgments of the adequacy of their fathers as identification models. Each group's responses to the survey were compared. The results indicate that there are no statistically significant differences between the two groups on the variables of satisfaction, having received counseling from others and optimism about the future. There are statistically significant differences between the current occupational status and future occupational plans of the two groups.  相似文献   
976.
The purpose of this study was to compare college students' perceptions of the similarity of occupations with the groupings suggested by Roe (1956). Subjects were 90 male and 99 female university freshmen. Four illustrative titles were selected from five of Roe's eight groups. Subjects were asked to judge the similarity of each of the possible pairs of titles. The results were analyzed using multidimensional scaling procedures. The data provide partial support for Roe's postulated structure, although the subject's perceptions were generally more complex than suggested by Roe. In particular, the hypothesized circumplex arrangement of groups received only limited support.  相似文献   
977.
978.
979.
980.
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