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   1118篇
  免费   40篇
  国内免费   1篇
耳鼻咽喉   13篇
儿科学   59篇
妇产科学   79篇
基础医学   82篇
口腔科学   30篇
临床医学   125篇
内科学   252篇
皮肤病学   46篇
神经病学   57篇
特种医学   14篇
外科学   92篇
综合类   45篇
一般理论   2篇
预防医学   147篇
眼科学   17篇
药学   80篇
肿瘤学   19篇
  2016年   6篇
  2015年   9篇
  2014年   10篇
  2013年   28篇
  2012年   6篇
  2011年   8篇
  2010年   38篇
  2009年   16篇
  2008年   12篇
  2001年   10篇
  1999年   15篇
  1998年   31篇
  1997年   39篇
  1996年   47篇
  1995年   36篇
  1994年   28篇
  1993年   28篇
  1992年   33篇
  1991年   28篇
  1990年   19篇
  1989年   20篇
  1988年   32篇
  1987年   24篇
  1986年   14篇
  1985年   30篇
  1984年   24篇
  1983年   26篇
  1982年   26篇
  1981年   15篇
  1980年   12篇
  1979年   13篇
  1978年   10篇
  1977年   11篇
  1975年   13篇
  1974年   6篇
  1972年   5篇
  1971年   7篇
  1969年   6篇
  1965年   7篇
  1964年   6篇
  1961年   5篇
  1960年   5篇
  1959年   38篇
  1958年   47篇
  1957年   54篇
  1956年   50篇
  1955年   51篇
  1954年   50篇
  1949年   16篇
  1948年   20篇
排序方式: 共有1159条查询结果,搜索用时 343 毫秒
1.
2.
3.
4.
Medical patients (N = 108) were administered a brief screeninginstrument (LAMSI) and a structured diagnostic interview (SUDDS).Twenty-five patients met DSM-III criteria for an alcohol usedisorder, 20 current, five in remission. The four-item scaleembedded in the screen identified the alcoholics with 88% sensitivityand 96% specificity.  相似文献   
5.
6.
Objective To evaluate parents’ fruit and vegetable intake and their use of pressure to eat in child feeding as predictors of their 5-year-old daughters’ fruit and vegetable, micronutrient, and fat intakes.Subjects Data were obtained from 191 non-Hispanic white families with 5-year-old girls.Design Parent data included reports of pressure in child feeding and their own fruit and vegetable intake. Girls’ intakes of fruits and vegetables, selected micronutrients, and fat were the main outcomes of interest.Statistical analysis Structural equation modeling was used to test a model describing relationships among parents’ fruit and vegetable intake, parents’ use of pressure in child feeding, and daughters’ fruit and vegetable, micronutrient, and fat intakes.Results The model provided a good fit to the data, revealing that girls’ fruit and vegetable intake was positively related to their parents’ reported fruit and vegetable intake. Parents who consumed fewer fruits and vegetables tended to report greater pressure in child feeding and had daughters who consumed fewer fruits and vegetables. Girls’ reported fruit and vegetable intakes were positively related to their micronutrient intakes and negatively associated with fat intake.Applications/conclusions This research demonstrates that parents’ own fruit and vegetable intake may encourage fruit and vegetable intake in their daughters, leading to higher micronutrient intakes and lower dietary fat intakes. Conversely, pressure to eat may discourage fruit and vegetable intake among young girls. J Am Diet Assoc. 2002;102:58–64.  相似文献   
7.
Benign positional vertigo is a potentially disabling condition characterized by episodic vertigo following certain provocative head movements. In most patients it is self limiting; however, in a few it may prove intractable, causing considerable social morbidity. In these patients surgery may be considered. Surgery previously involved section of the vestibular or singular nerves, involving a significant risk to hearing and to the facial nerve. Ablation of the labyrinth may even be considered. The new surgical technique of occlusion of the posterior semicircular canal has proved to be curative in most patients with benign positional vertigo with little risk to hearing. This paper describes our experience of fenestration and occlusion of the posterior semicircular canal in four patients.  相似文献   
8.
9.
Oral rehydration solutions (ORS) are widely promoted as a treatmentfor the dehydration associated with childhood diarrhoea. Manynational and global programmes have adopted ORS use rates derivedfrom surveys as their principal indicator of programme success.However, such widespread reliance on ORS use rates is ill-advised.The rate is very sensitive to the way the survey questions areasked. Discussed here are the terms identifying diarrhoeal episodes,the length of the reference period, and the ordering of questionsabout treatment practices. Furthermore, ORS rates are frequentlyused inappropriately, often in situations in which treatmentof a proportion of all diarrhoeal episodes is not the principalobjective.  相似文献   
10.
Deaths from sudden infant death syndrome (SIDS) between 1979 and 1984 were tabulated by month for weekdays, weekends and public holidays. Examination of deaths by day of the week showed the weekend had more deaths than the weekdays (χ2= 26.3, df = 6, p = 0.0002) and that this pattern occurred in both the under three months and three-11 months age group. There were 40 deaths on the 78 public holidays in the six years under study. Modelling the data showed that there was no difference between the number of deaths on holidays compared to weekends.  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