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   27245篇
  免费   227篇
  国内免费   7篇
教育   20582篇
科学研究   2390篇
各国文化   114篇
体育   1504篇
综合类   8篇
文化理论   469篇
信息传播   2412篇
  2021年   139篇
  2020年   221篇
  2019年   335篇
  2018年   2555篇
  2017年   2502篇
  2016年   1947篇
  2015年   373篇
  2014年   486篇
  2013年   3165篇
  2012年   566篇
  2011年   1080篇
  2010年   1083篇
  2009年   689篇
  2008年   1002篇
  2007年   1398篇
  2006年   429篇
  2005年   632篇
  2004年   675篇
  2003年   540篇
  2002年   368篇
  2001年   349篇
  2000年   321篇
  1999年   290篇
  1998年   152篇
  1997年   193篇
  1996年   208篇
  1995年   193篇
  1994年   161篇
  1993年   176篇
  1992年   248篇
  1991年   224篇
  1990年   223篇
  1989年   246篇
  1988年   252篇
  1987年   217篇
  1986年   212篇
  1985年   230篇
  1984年   200篇
  1983年   234篇
  1982年   181篇
  1981年   165篇
  1980年   160篇
  1979年   242篇
  1978年   186篇
  1977年   176篇
  1976年   156篇
  1975年   134篇
  1974年   124篇
  1973年   130篇
  1971年   107篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
Duchenne Muscular Dystrophy (DMD) is a neurogenetic developmental disorder that presents with progressive muscular weakness. It is caused by a mutation in a gene that results in the absence of specific products that normally localize to muscle cells and the central nervous system (CNS). The majority of affected individuals have IQs within the normal range, generally with lower verbal than performance IQ scores. Prior work has demonstrated selective deficits on tests of verbal span and immediate memory. For the current study, 26 boys with DMD (and normal intellectual function) and their unaffected siblings were evaluated. Paired comparisons demonstrated that the children with DMD had significantly poorer academic achievement scores than their siblings, even though their vocabulary levels and home and educational environments were comparable. Children with DMD also had more behavioral concerns, physical disabilities, and poorer verbal memory spans. Linear regression indicated that behavioral concerns, executive function, and physical disability did not contribute substantially to academic performance, whereas performance on verbal span did. DMD presents with a selective developmental aberration in verbal span that has wide‐ranging consequences on learning skills.  相似文献   
25.
本文要点: ◆遗传型是机体全部遗传基因的总和,代表了个体的遗传潜力.在决定个体的解剖、生化、生理、行为等特性或遗传表型(如褐色的眼睛、75kg的体重、50 ml/kg/min的最大摄氧量等)上起主导作用.  相似文献   
26.
27.
The article sets off with a brief summary of the history of appraisal and disposal of records as processed at the National Archives of Iceland (NAI) since its establishment in 1882 to present times. Rules on appraisal and disposal of records introduced in 1900, 1911, and 1916 were ignored and all records were kept. Status quo remained until 1985 when a new National Archives Act was passed. The appraisal and disposal process adopted then is described and explained. It included the publication of instructions on records management as well as forms relating to records management. The influence of acts of law on the appraisal and disposal process is explained. Finally the experience with the arrangement of organised appraisal in Iceland is described.  相似文献   
28.
Evidence shows that initial and advanced learning to read are predominantly mediated by the right and left cerebral hemispheres, respectively. Premature reliance on left-hemispheric reading strategies may result in L-type dyslexia, characterized by hurried and inaccurate reading. P-type dyslexia, characterized by a slow and fragmented style of reading, may result from the inability to shift from the predominant generation of right-hemispheric reading strategies to the predominant generation of left-hemispheric reading strategies. Results of investigations concerning the validity of the L/P-typology are discussed, as are the reading effects of hemisphere-specific and hemisphere-alluding stimulation in children with L- and P-type dyslexia.  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