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   73851篇
  免费   2228篇
  国内免费   30篇
  2020年   639篇
  2019年   790篇
  2018年   4296篇
  2017年   3625篇
  2016年   3223篇
  2015年   993篇
  2014年   1040篇
  2013年   4948篇
  2012年   2280篇
  2011年   4112篇
  2010年   3463篇
  2009年   2516篇
  2008年   3294篇
  2007年   3675篇
  2006年   1539篇
  2005年   1588篇
  2004年   1504篇
  2003年   1338篇
  2002年   1330篇
  2001年   1843篇
  2000年   1765篇
  1999年   1323篇
  1998年   734篇
  1997年   630篇
  1996年   563篇
  1995年   546篇
  1994年   541篇
  1993年   563篇
  1992年   1051篇
  1991年   1002篇
  1990年   986篇
  1989年   896篇
  1988年   842篇
  1987年   831篇
  1986年   829篇
  1985年   885篇
  1984年   700篇
  1983年   608篇
  1982年   509篇
  1980年   476篇
  1979年   680篇
  1978年   523篇
  1975年   625篇
  1974年   652篇
  1973年   626篇
  1972年   558篇
  1971年   493篇
  1968年   559篇
  1967年   560篇
  1966年   488篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
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   
36.
In three experiments we studied the relationship between contextual conditioning and the reinstatement of extinguished lever pressing that occurs when noncontingent food is introduced following extinction. In all three experiments the non-contingent food was presented off-baseline (with the response levers not present). On subsequent tests, with the response levers present, animals that had been exposed to food showed more reinstatement of lever pressing than control animals. This finding rules out alternative mechanisms for the reinstated responding that rely on the interaction of non-contingent food and responding, such as superstitious reinforcement or the discriminative after-effects of food. In addition, in each experiment we demonstrated that manipulations known to affect contextual conditioning (signalling the food in Experiment 1, context extinction in Experiment 2, and switching contexts in Experiment 3) reduced the reinstatement. These results are consistent with the claim that contextual conditioning is important in controlling instrumental conditioning and closely parallel findings concerning the reinstatement of Pavlovian responsing following extinction.  相似文献   
37.
38.
39.
This study examined the role of illness uncertainty in pain coping among women with fibromyalgia (FM), a chronic pain condition of unknown origin. Fifty-one FM participants completed initial demographic and illness uncertainty questionnaires and underwent 10-12 weekly interviews regarding pain, coping difficulty, and coping efficacy. Main outcome measures included weekly levels of difficulty coping with FM symptoms and coping efficacy. Multilevel analyses indicated that pain elevations for those high in illness uncertainty predicted increases in coping difficulty. Furthermore, when participants had more difficulty coping, they reported lower levels of coping efficacy. Results were consistent with hypothesized effects. Illness uncertainty accompanied by episodic pain negatively influenced coping efficacy, an important resource in adaptation to FM.  相似文献   
40.
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