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   74289篇
  免费   2974篇
  国内免费   40篇
  77303篇
  2020年   830篇
  2019年   1072篇
  2018年   1508篇
  2017年   1532篇
  2016年   1663篇
  2015年   1139篇
  2014年   1342篇
  2013年   6465篇
  2012年   2407篇
  2011年   2552篇
  2010年   1514篇
  2009年   1484篇
  2008年   2224篇
  2007年   2242篇
  2006年   1950篇
  2005年   1825篇
  2004年   1762篇
  2003年   1648篇
  2002年   1656篇
  2001年   2352篇
  2000年   2250篇
  1999年   1716篇
  1998年   898篇
  1997年   779篇
  1996年   736篇
  1995年   721篇
  1994年   675篇
  1993年   696篇
  1992年   1388篇
  1991年   1334篇
  1990年   1313篇
  1989年   1183篇
  1988年   1173篇
  1987年   1118篇
  1986年   1146篇
  1985年   1206篇
  1984年   944篇
  1983年   837篇
  1982年   665篇
  1979年   965篇
  1978年   724篇
  1975年   839篇
  1974年   932篇
  1973年   914篇
  1972年   787篇
  1971年   717篇
  1970年   680篇
  1968年   847篇
  1967年   813篇
  1966年   724篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Abstract: One claim about I , regularly made and almost universally endorsed, is that uses of the term are logically guaranteed to refer successfully (if they refer at all). The claim is only rarely formulated perspicuously or argued for. Such obscurity helps disguise the fact that those who profess to advance the claim actually turn out to support not a logical guarantee at all but merely high security through fortunate coincidence. This is not surprising. For we have no good reason to accept the claim – granted, any use of I is apt to refer successfully; but that can be explained by pragmatic features of its use. And we have some reason to reject the claim – it is notoriously difficult to see how genuine reference and guaranteed success do not exclude each other when considered as properties of the logic of any term.  相似文献   
22.
OBJECTIVE: To test a theoretical model of how ethnic pride and self-control are related to risk and protective factors. DESIGN: A community sample of 670 African American youth (mean age = 11.2 years) were interviewed in households. MAIN OUTCOME MEASURES: Measures of cigarette smoking, alcohol use, and sexual behavior (lifetime to past month). RESULTS: Structural modeling analyses indicated parenting was related to self-control and self-esteem, and racial socialization was related to ethnic pride. Self-control and self-esteem variables were related to levels of deviance-prone attitudes and to perceptions of engagers in, or abstainers from, substance use and sexual behavior. The proximal factors (behavioral willingness, resistance efficacy, and peer behavior) had substantial relations to the criterion variables. Participant gender and parental education also had several paths in the model. Results were generally similar for the 2 outcome behaviors. CONCLUSIONS: In this population, self-esteem and self-control are related to parenting approaches and have pathways to attitudes and social perceptions that are significant factors for predisposing to, or protecting against, early involvement in substance use and sexual behavior.  相似文献   
23.
24.
We report an eye movement experiment investigating the influence of the focus operator only on syntactic processing of "long" relative clause sentences. Paterson, Liversedge, and Underwood (1999) found that readers were garden pathed by "short" reduced relative clause sentences containing the focus operator only . They argued that due to thematic differences between "short" and "long" relative clause sentences, garden path effect might not occur when "long" reduced relative clause sentences are read. Eye-tracking data show that garden path effects found during initial processing of the disambiguating verb of "long" reduced sentences without only were absent or delayed in the case of counterparts with only . We discuss our results in terms of current theories of sentence processing.  相似文献   
25.
26.
27.
28.
The essay examines intellectual virtue in the Summa theologiae, taking it as an interpretative key to the epistemology of the Summa theologiae as a whole. Because Aquinas blurs the line between the acquired and the theological virtues, and between virtues and the gifts of the Spirit, it becomes impossible to maintain the distinction between the realms of nature and grace, or between natural reason and revealed truth: grace permeates the most ordinary activities of human reasoning. This reading of the Summa theologiae raises questions about many contemporary debates, particularly those concerning natural law.  相似文献   
29.
30.
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