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   102872篇
  免费   4246篇
  国内免费   37篇
  2020年   1110篇
  2019年   1371篇
  2018年   1899篇
  2017年   1959篇
  2016年   2057篇
  2015年   1482篇
  2014年   1757篇
  2013年   8349篇
  2012年   3290篇
  2011年   3412篇
  2010年   2105篇
  2009年   2125篇
  2008年   2979篇
  2007年   2985篇
  2006年   2737篇
  2005年   2373篇
  2004年   2284篇
  2003年   2174篇
  2002年   2215篇
  2001年   3294篇
  2000年   3153篇
  1999年   2382篇
  1998年   1177篇
  1997年   1044篇
  1996年   1083篇
  1995年   988篇
  1993年   968篇
  1992年   2001篇
  1991年   1872篇
  1990年   1884篇
  1989年   1732篇
  1988年   1690篇
  1987年   1606篇
  1986年   1649篇
  1985年   1705篇
  1984年   1445篇
  1983年   1288篇
  1982年   944篇
  1979年   1515篇
  1978年   1109篇
  1975年   1221篇
  1974年   1357篇
  1973年   1466篇
  1972年   1220篇
  1971年   1145篇
  1970年   1018篇
  1969年   1037篇
  1968年   1305篇
  1967年   1173篇
  1966年   1059篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
A national survey was conducted to compare the background and career characteristics of men and women engineers differing in the number of years since they completed their BS degrees (0–5, 6–10, 11–15, and 16–20 years). The parents of women engineers were more likely to have college degrees and to be employed in professional positions than were the parents of men engineers. Women engineers were less likely to be married and were more likely to be childless than were the men. Both men and women were influenced by courses and work–related factors in their decisions to pursue engineering, but men made their career decisions sooner than women. Although men and women reported comparable levels of technical responsibility in their present jobs, gender differences favoring men were found for supervisory responsibility and salary among those with more than five years of experience, with the gap between men and women increasing with experience. Men with 16–20 years of experience and all four degree cohorts of women endorsed the opinion that there are better opportunities for men than women in engineering.  相似文献   
112.
Book reviews     
TOATES, F. Animal Behaviour: A Systems Approach. Chichester: John Wiley and Sons. 1980. Pp. 299. Hardback £17. Paper back £6.40 ISBN 0 471 27724.

DICKINSON, A. Contemporary Animal Learning Theory. Cambridge: University Press. 1980. Pp. 177. Hardback £12.50. Paperback £3.95. ISBN 0 521 23469 7.  相似文献   
113.
114.
Despite this virtue's history as an instrument of women's oppression, modesty, at its most basic, means voluntary restraint of one's power, undertaken for the sake of others. It is a mechanism that modifies unequal power relationships and encourages greater compassion and fairness. I use a Christian perspective with influences from Jewish and Muslim sources to examine modesty. The modest person, I argue, must be in relationship with others, must be honestly aware of her impacts on others, must be sensitive to those impacts, compassionate toward others, and willing to hold back for others' sakes. Moreover, modesty is not only a virtue that pertains to sexuality and clothing, but it also can promote virtuous environmental behavior, particularly as it leads to awareness of, and sensitivity to, the effects of everyday behaviors on vulnerable others.  相似文献   
115.
116.
Although a great deal of research has been conducted on the relationship between social support and physical health, the contribution of personality characteristics to this relationship has rarely been assessed. Structural equation modeling was employed to derive and test a model of the direct and indirect relationships between personality characteristics, social network size, the perceived availability of support, socially supportive behaviors, and perceived physical health with a sample of Pennsylvania adults. Significant paths indicate that individuals who perceive themselves as affiliative and as help seekers and help givers report larger social networks, receive more socially supportive behaviors, and perceive that more support is available to them. The perception that support is available shared a direct relationship with perceived physical health. The utility of including multiple measures of social support and personality characteristics related to receiving support in investigations of the relationship between social support and physical health is discussed.  相似文献   
117.
118.
119.
120.
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