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   516885篇
  免费   33635篇
  国内免费   616篇
耳鼻咽喉   6900篇
儿科学   16914篇
妇产科学   13613篇
基础医学   85331篇
口腔科学   14521篇
临床医学   44607篇
内科学   94127篇
皮肤病学   12194篇
神经病学   36518篇
特种医学   18565篇
外国民族医学   63篇
外科学   77449篇
综合类   8555篇
一般理论   123篇
预防医学   39303篇
眼科学   12174篇
药学   40836篇
中国医学   1007篇
肿瘤学   28336篇
  2018年   4977篇
  2015年   4556篇
  2014年   6123篇
  2013年   9639篇
  2012年   13047篇
  2011年   14437篇
  2010年   8378篇
  2009年   7846篇
  2008年   13848篇
  2007年   14841篇
  2006年   15073篇
  2005年   14461篇
  2004年   14150篇
  2003年   13496篇
  2002年   13352篇
  2001年   24149篇
  2000年   25166篇
  1999年   20644篇
  1998年   5448篇
  1997年   4740篇
  1996年   5072篇
  1995年   4659篇
  1994年   4352篇
  1993年   4168篇
  1992年   15782篇
  1991年   16377篇
  1990年   16487篇
  1989年   15837篇
  1988年   14624篇
  1987年   14465篇
  1986年   13635篇
  1985年   13003篇
  1984年   9653篇
  1983年   8282篇
  1982年   4590篇
  1981年   4258篇
  1979年   9443篇
  1978年   6885篇
  1977年   5800篇
  1976年   5626篇
  1975年   6412篇
  1974年   7663篇
  1973年   7150篇
  1972年   6987篇
  1971年   6704篇
  1970年   6191篇
  1969年   5905篇
  1968年   5583篇
  1967年   5033篇
  1966年   4461篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
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   
52.
53.
In order to satisfy the need to restore the aesthetics, phonetics and comfort and to facilitate optimal hygiene procedures, 20 edentulous patients were treated with a new concept of overdenture therapy on implants ad modum Brånemark. After 24±3.5 months the patients were re‐examined. They were asked to answer a questionnaire and use a Visual Analogue Scale (VAS) to give their opinion on the prosthetic treatment. The results indicate that an implant‐retained overdenture in the maxilla with this design can satisfy the patients needs in aesthetics, phonetics and comfort and can 1 facilitate oral hygiene measures.  相似文献   
54.
55.
56.
57.
58.
A retrospective analysis of results of treatment of 104 patients with fractures of long tubular bones associated with injuries of peripheral nerves has shown complex therapy to be necessary. Main components of this treatment were biogenic stimulators, vitamin B12, spasmolytic and dehydration drugs in combination with electrophoresis with potassium iodide and thermal procedures. Rapid disturbance of conductivity of nerve trunks after trauma should be followed by revision of the given segment of the extremity in order to remove hematoma and make reposition of displaced fragments of the bone, which can provide recovery of the disturbed function of the nerve.  相似文献   
59.
On the basis of experience with the treatment of more than 1,500 patients with post-burn defects, deformities, and trophic ulcers, the authors distinguished types of affection in which the traditional methods are ineffective. These 133 patients were subjected to plasty with ++cutaneo-fascial grafts; the zones of donor areas from which the grafts are taken are determined. Plasty with ++cutaneo-fascial grafts is indicated in defects of the face, deformity of the neck, total adduction contracture of the arm, defect of the breast, and affections of the hand, leg, and foot. Concrete grafts and the site from which they are taken for restoration of certain regions of the body are suggested. ++Cutaneo-fascial grafts make it possible to restore the shape, function, and the skin of the involved region.  相似文献   
60.
The blood supply to the kidneys was studied in 106 children with urological diseases from angiograms. Computer analysis of 322 angiograms of patients with renal hypoplasia, dysplasia, hydronephrosis, megaureter, and abnormal mobility of the kidney was carried out. The results of angiography of a healthy kidney in 64 children were used to determine the normal parameters. The author gives a quantitative appraisal of the area of the kidney and its vessels, the calculation of the percentage of kidney vascularization, determination of the area of the renal cortex, the area of its vessels and percentage of vascularization, and the diameter of the large renal vessels. The study showed that the most informative parameters of the angiograms are as follows: the area of the renal vessels and its cortex, the percentage of vascularization of the Kidney and its cortex. Renal hypoplasia, dysplasia, megaureter, and hydronephrosis are characterized by different variants of disturbed blood supply of various severity.  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