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   5798篇
  免费   845篇
  国内免费   81篇
耳鼻咽喉   56篇
儿科学   181篇
妇产科学   28篇
基础医学   398篇
口腔科学   244篇
临床医学   597篇
内科学   422篇
皮肤病学   15篇
神经病学   414篇
特种医学   365篇
外科学   964篇
综合类   1034篇
一般理论   7篇
预防医学   1122篇
眼科学   27篇
药学   408篇
  7篇
中国医学   362篇
肿瘤学   73篇
  2024年   12篇
  2023年   177篇
  2022年   221篇
  2021年   447篇
  2020年   369篇
  2019年   374篇
  2018年   262篇
  2017年   325篇
  2016年   302篇
  2015年   315篇
  2014年   305篇
  2013年   400篇
  2012年   295篇
  2011年   340篇
  2010年   272篇
  2009年   244篇
  2008年   266篇
  2007年   260篇
  2006年   230篇
  2005年   180篇
  2004年   170篇
  2003年   153篇
  2002年   108篇
  2001年   87篇
  2000年   96篇
  1999年   59篇
  1998年   67篇
  1997年   45篇
  1996年   37篇
  1995年   39篇
  1994年   31篇
  1993年   25篇
  1992年   17篇
  1991年   19篇
  1990年   13篇
  1989年   14篇
  1988年   24篇
  1987年   23篇
  1986年   10篇
  1985年   21篇
  1984年   15篇
  1983年   5篇
  1982年   9篇
  1981年   5篇
  1980年   7篇
  1979年   5篇
  1978年   4篇
  1976年   3篇
  1975年   4篇
  1974年   5篇
排序方式: 共有6724条查询结果,搜索用时 984 毫秒
11.
12.
13.
Background:  Previous studies into leisure have employed methodologies that may understate the significance of experiential components. This exploratory study investigated the leisure experiences of retired Australians over 65 years of age.
Methods:  Five semistructured interviews were used to explore the leisure experience of older people from metropolitan Adelaide. Data were coded and analysed thematically.
Results:  Relaxation and engrossment emerged as commonly expressed experiences, yet were found to emerge as a result of engagement in occupations predefined as leisure. Experiences of freedom from both necessary duties and a sense of obligation were discussed as potential determinants of leisure consciousness.
Practice implications:  This study highlights a need for therapists to actively access clients' subjective leisure experiences to enable engagement in personally meaningful leisure occupations.  相似文献   
14.
学习困难儿童智力及记忆力特征分析   总被引:4,自引:3,他引:1  
目的探讨学习困难儿童的智力、记忆力特征。方法学习困难(LD)根据ICD-10五条诊断标准,精神发育迟滞(MR)根据国际疾病分类第10版(ICD-10)诊断标准,分为实验组LD组;对照组a.正常组,b.弱智组。采用中国韦氏儿童智力量表进行智力测验,记忆力测验采用中国科学研究院编制的临床记忆量表。结果LD组与正常对照组在语言智商、操作智商、总智商[(86.23±10.65)分,(87.44±12.59)分,(84.09±13.96)分vs(102.27±10.21)分,(103.22±11.65)分,(103.28±9.88)分]及分测验值差异均有显著性(P<0.01);LD组儿童VIQ与PIQ相距一个标准差以上的比率明显高于对照组(2=9.29,P<0.01),也较MR对照组多(2=4.29,P<0.05)。LD组记忆商(MQ)明显低于正常对照组(P<0.01)。结论LD儿童智商、记忆商水平低于正常儿童,且存在明显智力结构发展不平衡。  相似文献   
15.
16.
Reflections and Perspectives on Pediatric Psychology: Editor's Vale Dictum   总被引:4,自引:3,他引:1  
Reviews major activities of the Editor and changes in the Journalof Pediatric Psychology (JPP) for issues published in 1993 through1997. Significant trends and accomplishments are reviewed, includingthe increased use of Special Issues and Special Sections tohighlight current pediatric psychological research. Articlespublished during the term are analyzed interms of article typeand population type Comarisons are made to earlier trends inJPP publication as reported by Roberts (1 992).  相似文献   
17.
Smoking and raven IQ   总被引:1,自引:0,他引:1  
Nicotine has recently been shown to enhance measures of information processing speed including the decision time (DT) component of simple and choice reaction time and the string length measure of evoked potential waveform complexity. Both (DT and string length) have been previously demonstrated to correlate with performance on standard intelligence tests (IQ). We therefore hypothesised that nicotine is acting to improve intellectual performance on the elementary information processing correlates of IQ. In the current experiment we tested this hypothesis using the Raven Advanced Progressive Matrices (APM) test. APM scores were significantly higher in the smoking session compared to the non-smoking session, suggesting that nicotine acts to enhance physiological processes underlying performance on intellectual tasks.  相似文献   
18.
化学品环境管理与水生实验动物   总被引:3,自引:1,他引:2  
从分析化学品的特性入手,在概述化学品的环境管理对水生实验生物需求和国内外水生实验生物发展现状的基础上,从加强化学品环境管理的科学基础建设出发,对我国水生实验生物的研究与发展的标准化、产业化、必要的资质认可及信息交流提出建议。  相似文献   
19.
Studies using plaster models of teeth and photographs simulating the full range of occlusal conditions have found high agreement between measures of adolescent social acceptability of these conditions and perceived need for orthodontic treatment. This study examined the association between adolescents' acceptability of their own occlusal condition, severity of malocclusion, and likelihood of undergoing orthodontic treatment. The factors predicting the acceptability of occlusal condition of 13-yr-olds, as assessed by the SASOC scale, were measurements of acceptability of general physical appearance, and the severity of occlusal condition. Variability in SASOC scores appeared to be independent of gender, socioeconomic status, and ethnicity. Gender, and severity of occlusal condition were important differences between subjects who had received, planned, or were undergoing orthodontic treatment, and those who had not. Neither SASOC scores nor perceived need for treatment accounted for a significant proportion of the variance between these groups. Although adolescents seeking orthodontic treatment had a greater severity of malocclusion than those not, little difference was observed between these groups in acceptance of occlusal condition.  相似文献   
20.
白马藏人是一支有待识别的民族。本文以肤纹作聚类分析,结果表明白马藏人与藏族的距离很大,很有可能是一支独立的民族。  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