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   2502112篇
  免费   182786篇
  国内免费   3818篇
耳鼻咽喉   33773篇
儿科学   80016篇
妇产科学   65876篇
基础医学   367880篇
口腔科学   67146篇
临床医学   226380篇
内科学   488304篇
皮肤病学   53723篇
神经病学   200262篇
特种医学   92874篇
外国民族医学   502篇
外科学   377239篇
综合类   50239篇
现状与发展   14篇
一般理论   1087篇
预防医学   197755篇
眼科学   57615篇
药学   185740篇
  12篇
中国医学   4806篇
肿瘤学   137473篇
  2021年   21332篇
  2019年   21797篇
  2018年   29819篇
  2017年   22638篇
  2016年   25111篇
  2015年   28503篇
  2014年   40287篇
  2013年   60333篇
  2012年   83684篇
  2011年   89521篇
  2010年   52870篇
  2009年   49791篇
  2008年   84411篇
  2007年   89812篇
  2006年   90301篇
  2005年   88181篇
  2004年   84390篇
  2003年   81082篇
  2002年   78450篇
  2001年   110152篇
  2000年   112527篇
  1999年   95022篇
  1998年   29021篇
  1997年   25464篇
  1996年   25693篇
  1995年   24165篇
  1994年   22232篇
  1993年   20972篇
  1992年   72919篇
  1991年   70956篇
  1990年   69208篇
  1989年   66363篇
  1988年   61075篇
  1987年   59891篇
  1986年   56000篇
  1985年   53833篇
  1984年   40429篇
  1983年   34534篇
  1982年   21209篇
  1979年   36498篇
  1978年   26382篇
  1977年   21939篇
  1976年   20996篇
  1975年   22369篇
  1974年   26703篇
  1973年   25304篇
  1972年   23544篇
  1971年   22313篇
  1970年   20515篇
  1969年   19515篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The late results--up to six years--after axillo-femoral bypass reconstruction are reported for 85 patients with leg ischaemia who were regarded as poor-risk patients for aortic bypass surgery, or who had aortic graft infection. Velour-Dacron grafts and expanded polytetrafluoroethylene (PTFE, Gore-Tex)--grafts have been used. The cumulative patency rate (life table) six years after graft implantation was 64% (PTFE-grafts) and 58% (Velour-Dacron grafts). The corresponding cumulative limb salvage rate six years after graft implantation was 88% when PTFE grafts were used and 77% when Velour-Dacron grafts were used. Our results demonstrate that axillo-femoral reconstruction is a useful procedure with a good patency rate 6 years after implantation. This procedure should be considered when dealing with poor risk patients with severe leg ischaemia.  相似文献   
992.
993.
994.
Simultaneous recording of the spirogram, pneumotachogram and transpulmonary pressure as well as total plethysmography were applied in 30 patients with bronchial asthma to study the respiratory ventilation and mechanism before and after single procedures of acupuncture. The bronchodilatory action of acupuncture has been proved, related, in particular, with a significant decrease of non-elastic resistance of the lungs. At the same time pronounced changes in the elastic resistance were noted. However, they appeared to be of different directions. The improvement of ventilatory function was determined not only by a decrease in the intrapulmonary resistance but also by shifts in respiratory regulation and in the activity of the respiratory musculature, confirmed by an analysis of the curves of the respiratory work obtained before and after acupuncture. The curative action of acupuncture in bronchial asthma cannot be adequately explained by the placebo effect.  相似文献   
995.
996.
Spinal Ewing's sarcomas are rare and cause problems in differential diagnosis. The radiologic, nuclear medicine and CT findings in two children with histologically proven Ewing's sarcoma are presented and problems in differential diagnosis discussed. Biopsy should be done early.  相似文献   
997.
998.
999.
We report histological changes in four patients with port wine stains treated with 578 nm yellow light from a high power copper vapour laser. Histology showed that selective damage occurred to the ectatic blood-vessels in the dermis, without haemorrhage and damage to non-vascular structures, and without scarring. The initial damage to the overlying epidermis was not permanent, and the damaged ectatic vessels returned to normal size or were completely necrosed and replaced by collagen.  相似文献   
1000.
The present status of total colectomy with ileorectal anastomosis in the surgical treatment of inflammatory bowel disease is examined. Special reference is made to the different indications for the use of the operation in Crohn's disease and in ulcerative colitis. The late results are illustrated by the outcome in the 59 patients in a personal series, and other published results.  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