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   530749篇
  免费   27647篇
  国内免费   496篇
耳鼻咽喉   6690篇
儿科学   16945篇
妇产科学   12542篇
基础医学   92632篇
口腔科学   12361篇
临床医学   48505篇
内科学   95485篇
皮肤病学   11876篇
神经病学   34025篇
特种医学   19758篇
外国民族医学   53篇
外科学   78141篇
综合类   8079篇
现状与发展   2篇
一般理论   107篇
预防医学   38551篇
眼科学   11943篇
药学   41420篇
  1篇
中国医学   1127篇
肿瘤学   28649篇
  2021年   3900篇
  2018年   5740篇
  2017年   4130篇
  2016年   4876篇
  2015年   5366篇
  2014年   7123篇
  2013年   10515篇
  2012年   15625篇
  2011年   17433篇
  2010年   9983篇
  2009年   8833篇
  2008年   15783篇
  2007年   17521篇
  2006年   17021篇
  2005年   16332篇
  2004年   15971篇
  2003年   15362篇
  2002年   14800篇
  2001年   22434篇
  2000年   22976篇
  1999年   18922篇
  1998年   5235篇
  1997年   4365篇
  1996年   4397篇
  1995年   4124篇
  1992年   14414篇
  1991年   15818篇
  1990年   15950篇
  1989年   15625篇
  1988年   14310篇
  1987年   14199篇
  1986年   13171篇
  1985年   12686篇
  1984年   9398篇
  1983年   8003篇
  1982年   4177篇
  1979年   8941篇
  1978年   6382篇
  1977年   5149篇
  1976年   5504篇
  1975年   6613篇
  1974年   7421篇
  1973年   7158篇
  1972年   6597篇
  1971年   6309篇
  1970年   5887篇
  1969年   5467篇
  1968年   5161篇
  1967年   4624篇
  1966年   3963篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The authors analyse the results of diagnosis and surgical treatment of various forms of reflux esophagitis in 426 patients. The disease was caused by hiatal hernia in 60.4% of patients, by various operations on the cardia in 22%, and by gastric and duodenal ulcer in 8.2% of patients. Various diagnostic methods are evaluated, among which intraesophageal pH measurement and esophagofibroscopy are particularly important. The indications for operative treatment are formulated. Operations were carried out on 349 patients, complications occurred in 15%. The lethality was 0.6%. Nissen's fundoplication is the operation of choice.  相似文献   
992.
It is posited that diarrhoeal illness during one period has influence on diarrhoeal illness in a subsequent period. This relationship may potentially mask the association between malnutrition and subsequent diarrhoea. To test this, we analysed data on cross-sectional anthropometry in combination with data on diarrhoeal morbidity collected longitudinally in a community-based study of 1262 children (aged 6-60 months) during March-December, 1976, in Matlab, Bangladesh. The results confirmed the posited relationship between diarrhoeal morbidities in two consecutive periods and showed that the risks of diarrhoeal attack and longer diarrhoeal illness increased more than threefold during the 2 months following diarrhoeal illness during the preceding 2 months (previous diarrhoea). Children with no previous diarrhoea indicated a positive association between malnutrition and subsequent diarrhoea, but the pattern found among children with previous diarrhoea was not understandable. Logistic regression analyses performed separately for younger and older children showed that controlling for effects of previous diarrhoea, maternal illiteracy and household poverty, severe malnutrition as assessed by weight-for-age was found to be strongly associated with the risk of longer diarrhoeal illness in a 2-month interval in the age group 24-60 months; in the same age group the association with the risk of diarrhoeal attack was significant at the 10 per cent level. No such association for malnutrition, however, was found in the age group 6-23 months.  相似文献   
993.
994.
We report the first case of membranous lupus nephritis occurring in a child with congenital AIDS. Hypocomplementemia, elevated titers of anti-nuclear antibody and antibody to double-stranded DNA supported the diagnosis of associated systemic lupus erythematosus (SLE). The pathogenetic implications of this coexistence of AIDS and SLE are discussed.  相似文献   
995.
Plasmapheresis was used to correct blood lipid composition in patients with angina at rest and angina of effort (functional classes 3-4). In addition to a drop in total cholesterol and triglycerides, cholesterol in low and very-low-density lipoproteins fell abruptly, while high-density-lipoprotein cholesterol, on the contrary, increased considerably. Clinical improvement of the patients was also recorded.  相似文献   
996.
997.
998.
999.
1000.
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