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   206202篇
  免费   8840篇
  国内免费   160篇
  2020年   2817篇
  2019年   3491篇
  2018年   4013篇
  2017年   4335篇
  2016年   4951篇
  2015年   3966篇
  2014年   4831篇
  2013年   23582篇
  2012年   5690篇
  2011年   5148篇
  2010年   4433篇
  2009年   5050篇
  2008年   5172篇
  2007年   4745篇
  2006年   5015篇
  2005年   4837篇
  2004年   4388篇
  2003年   3980篇
  2002年   3792篇
  2001年   4822篇
  2000年   4579篇
  1999年   4083篇
  1998年   2975篇
  1997年   2777篇
  1996年   2697篇
  1995年   2516篇
  1994年   2483篇
  1993年   2423篇
  1992年   3396篇
  1991年   3198篇
  1990年   3091篇
  1989年   2949篇
  1988年   2915篇
  1987年   2830篇
  1986年   2857篇
  1985年   3106篇
  1984年   3003篇
  1983年   2684篇
  1982年   2523篇
  1981年   2471篇
  1980年   2320篇
  1979年   2783篇
  1978年   2477篇
  1977年   2366篇
  1976年   2220篇
  1975年   2480篇
  1974年   2661篇
  1973年   2612篇
  1972年   2121篇
  1971年   2012篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
I have benefited greatly from discussing the issues addressed in this paper with Michael Liston, John Vickers and Mark Wilson.  相似文献   
902.
Fixation accuracy was related to perception of laterally presented consonants. Small left-eye fixation inaccuracy influenced perceptual performance of 8 men and 8 women.  相似文献   
903.
904.
905.
W Lüders 《Psyche》1988,42(3):216-220
  相似文献   
906.
907.
Visual cognitive differences between hearing (N = 16) and deaf (N = 32) high-school and middle-school students were studied. Visual tasks were presented on a microcomputer and response latencies were collected. Significant differences were noted between the deaf and normal groups but not between total communication deaf and oral deaf students. These differences support the hypothesis that deaf students prefer a visual cognitive strategy. Implications for educating the deaf are discussed.  相似文献   
908.
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   
909.
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   
910.
In the present study inquiries have been made about the changes EEG cross-correlation in mental activities is subject to. The EEG recordings were made at rest, in visual and acoustical response, when reading and in the solution of an acoustical differentiation problem. In conjunction with plain reflex processes a decline in the intrahemispherical correlation was observed. During complex-structured psycho-request situations dissimilar changes in the EEG correlation have occurred on the scalp. Between the cerebral regions functionally essential for the solution of the problems, an increase in the bio-electric correlation and between other cerebral areas a decline were registered. The findings in conclusion come to realize that the topographic EEG cross-correlation analysis is appropriate to give an insight into the present situation of cerebral functional organization.  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