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   781170篇
  免费   53908篇
  国内免费   1553篇
耳鼻咽喉   10117篇
儿科学   25362篇
妇产科学   18797篇
基础医学   119651篇
口腔科学   21315篇
临床医学   71132篇
内科学   150129篇
皮肤病学   17415篇
神经病学   57027篇
特种医学   28866篇
外国民族医学   80篇
外科学   116954篇
综合类   15909篇
现状与发展   2篇
一般理论   273篇
预防医学   56931篇
眼科学   17625篇
药学   58622篇
  3篇
中国医学   2434篇
肿瘤学   47987篇
  2021年   6808篇
  2019年   6849篇
  2018年   9565篇
  2017年   7345篇
  2016年   8164篇
  2015年   9101篇
  2014年   12671篇
  2013年   18787篇
  2012年   25729篇
  2011年   27043篇
  2010年   15814篇
  2009年   14680篇
  2008年   25060篇
  2007年   26836篇
  2006年   27135篇
  2005年   25800篇
  2004年   25009篇
  2003年   23615篇
  2002年   22928篇
  2001年   36979篇
  2000年   37380篇
  1999年   31062篇
  1998年   8785篇
  1997年   7455篇
  1996年   7656篇
  1995年   7278篇
  1994年   6673篇
  1993年   6107篇
  1992年   23387篇
  1991年   23338篇
  1990年   22696篇
  1989年   22424篇
  1988年   20360篇
  1987年   19745篇
  1986年   18759篇
  1985年   17607篇
  1984年   13090篇
  1983年   11119篇
  1982年   6368篇
  1979年   11729篇
  1978年   8344篇
  1977年   6995篇
  1976年   6750篇
  1975年   7379篇
  1974年   8637篇
  1973年   8238篇
  1972年   7733篇
  1971年   7188篇
  1970年   6925篇
  1969年   6356篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
The great majority of traumatic brain injury (TBI) is of mild severity, with Glasgow Coma Scores (GCS) of 13-15, post-traumatic amnesia of less than 48 hours and brief, if any, hospitalization. All mild TBI admissions to hospital were provided with education in the form of a brief interview and a brochure on minor head trauma from the National Head Injury Foundation. Seventy-seven insured individuals with mild TBI were contacted by phone between 1 and 3 months post-injury to determine the frequency and severity of post-traumatic symptoms and the rate of return to work (RTW). Twenty-six per cent of those contacted had subjective complaints; 88% had returned to work or school; 16% of those returning did so with some symptoms. Only 45% of symptomatic individuals sought medical consultation for their condition when offered. Education about post-traumatic symptoms from the onset may provide sufficient reassurance to most individuals that future use of medical services is seen as unnecessary. Rate of RTW is relatively higher than reported in previous studies of mild TBI.  相似文献   
42.
Acute renal failure (ARF) developed in a 7-week-old infant due to bilateral candidal bezoars (fungal balls) causing obstruction at the pelviureteric junction. The baby was born at term with an appropriate birthweight, and had been treated with broad-spectrum antibiotics for respiratory distress and septicemia during the 1st week of life. Recovery from ARF followed renal decompression with bilateral nephrostomy tube placement and parenteral administration of amphotericin B and 5-flucytosine. Received August 21, 1996; received in revised form and accepted January 3, 1997  相似文献   
43.
44.
45.
46.
47.
48.
Eighty-nine cases of chronic bronchitis were matched against167 asymptomatic controls from the glass bangle industry ofFirozabad. Factors of age, social status, smoking habit andduration of exposure were studied. Duration of exposure wasfound to be a factor contributing significantly to the causationof disease. Requests for reprints should be addressed to: Dr B. N. Gupta, Division of Epidemilogy, Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Lucknow P.O. Box 80, 226001, India  相似文献   
49.
50.
The role of caffeine or coffee in causing or promoting the incidence of serious disease is equivocal. Two design factors may account for the discrepancies in reported findings on the effects of coffee drinking: (a) imprecision of measurement and (b) confounding variables. A study of 2,714 white U.S. adults disclosed that, of 32 risk factors analyzed by linear and logistic regression, only sex and cigarette smoking were found to be important potential confounders of caffeine and coffee intake. Partial R2 values of the other 30 risk factors were relatively small and were inconsistent for each sex. It is unlikely that any of these factors could explain any of the reported associations between caffeine or coffee consumption and certain diseases. However, certain weak associations with caffeine or coffee intake should be included in the study design when they are known to be risk factors of a disease under investigation. These factors for men are dietary fat intake, vitamin C intake, and body mass index; and for women are vitamin use, alcohol intake, stress, and perceived health status.  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