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   22838篇
  免费   870篇
  国内免费   16篇
  2020年   259篇
  2019年   281篇
  2018年   521篇
  2017年   512篇
  2016年   588篇
  2015年   413篇
  2014年   398篇
  2013年   1541篇
  2012年   875篇
  2011年   937篇
  2010年   449篇
  2009年   422篇
  2008年   567篇
  2007年   543篇
  2006年   494篇
  2005年   1707篇
  2004年   1037篇
  2003年   806篇
  2002年   501篇
  2001年   752篇
  2000年   726篇
  1999年   507篇
  1998年   217篇
  1997年   198篇
  1996年   167篇
  1995年   162篇
  1993年   157篇
  1992年   406篇
  1991年   369篇
  1990年   401篇
  1989年   379篇
  1988年   346篇
  1987年   334篇
  1986年   350篇
  1985年   339篇
  1984年   271篇
  1983年   238篇
  1979年   232篇
  1978年   183篇
  1977年   154篇
  1975年   214篇
  1974年   284篇
  1973年   241篇
  1972年   232篇
  1971年   185篇
  1970年   168篇
  1969年   217篇
  1968年   221篇
  1967年   177篇
  1966年   198篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
82.
The Rosenberg Self-esteem Scale was administered to 550 14- and 16-yr.-old (+/- 6 mo.) girls. Self-esteem scores were categorized by weight and weight by height. Scores on the Quetelet Index for obesity were correlated with self-esteem scores. Mean self-esteem of the low- and middle-weight by height group was significantly higher than the mean of the high-weight by height group. In analyzing weight alone, the self-esteem of the middle-weight group was significantly higher than the self-esteem of the high-weight group. The correlation of the obesity index and self-esteem indicated that as weight increased self-esteem decreased.  相似文献   
83.
Observations on three children with neurolisteriosis (one case of meningitis, two cases of meningoencephalitis, each Serovar 4 b), show that even after the neonatal period, listeriosis must not be ignored in the process of diagnosis and therapy. It is the bacteriological examination of the cerebrospinal fluid, together with the blood culture, and not clinical symptoms and serology that guarantee a timely diagnosis and therapy (ampicillin and gentamicin).  相似文献   
84.
85.
86.
87.
88.
89.
90.
Stress in time     
The goals of this research were to determine whether speakers adjust the stress patterns of words within sentences to create an alternation between strong and weak beats and to explore whether this rhythmic alternation contributes to the characteristics stress differences between two major lexical categories of English. Two experiments suggested that speakers do alter lexical stress in accordance with rhythmic biases. When speakers produced disyllabic pseudowords in sentence contexts, they were more likely to place stress on the first syllable when the pseudoword was preceded by a weak stress and followed by a strong one than when the strong stress preceded and the weak followed. This occurred both when the pseudowords served as nouns and when they served as verbs. Text analyses further revealed that weakly stressed elements precede nouns more often than verbs, whereas such elements follow verbs more often than nouns. Thus, disyllabic nouns are more likely than disyllabic verbs to occupy contexts biased toward trochaic rhythm, a finding consistent with leftward dominant stress in disyllabic English nouns. The history of stress changes in English nouns and verbs also conforms with the view that rhythmic context may have contributed to the evolution of stress differences. Together, the findings suggest that the citation stress patterns of words may to some degree reflect adaptations of lexical knowledge to conditions of language performance.  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