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   1607104篇
  免费   106656篇
  国内免费   3569篇
耳鼻咽喉   21090篇
儿科学   53717篇
妇产科学   43407篇
基础医学   238319篇
口腔科学   45382篇
临床医学   144974篇
内科学   306164篇
皮肤病学   36467篇
神经病学   121363篇
特种医学   60355篇
外国民族医学   376篇
外科学   238312篇
综合类   36365篇
现状与发展   2篇
一般理论   522篇
预防医学   122001篇
眼科学   36968篇
药学   118049篇
  28篇
中国医学   4120篇
肿瘤学   89348篇
  2018年   17139篇
  2017年   13363篇
  2016年   15069篇
  2015年   16803篇
  2014年   22946篇
  2013年   34875篇
  2012年   46100篇
  2011年   48871篇
  2010年   29158篇
  2009年   27466篇
  2008年   45568篇
  2007年   48657篇
  2006年   49378篇
  2005年   46906篇
  2004年   45799篇
  2003年   43898篇
  2002年   42528篇
  2001年   76921篇
  2000年   78804篇
  1999年   65518篇
  1998年   17927篇
  1997年   15681篇
  1996年   16000篇
  1995年   15246篇
  1994年   14098篇
  1993年   13147篇
  1992年   51539篇
  1991年   50597篇
  1990年   49651篇
  1989年   48498篇
  1988年   44135篇
  1987年   43662篇
  1986年   41025篇
  1985年   39379篇
  1984年   29169篇
  1983年   24652篇
  1982年   14299篇
  1981年   12826篇
  1979年   26761篇
  1978年   19161篇
  1977年   16134篇
  1976年   15398篇
  1975年   16481篇
  1974年   19682篇
  1973年   18891篇
  1972年   17582篇
  1971年   16304篇
  1970年   15397篇
  1969年   14303篇
  1968年   13203篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
A true comparison of long-term medical and surgical treatment in gastro-oesophageal reflux disease (GORD) is impossible as few studies have been carried out with adequate randomisation of the patients and long-term evaluation of quality of life. In general the control of the reflux symptoms is roughly equal with medical and surgical treatment. However, surgery can cause other symptoms such as dysphagia or non-specific epigastric discomfort or pain in some patients, which reduces the overall efficacy in controlling the symptoms. Based on a cost utility analysis, Heudebert et al. came to the conclusion that medical treatment was their preferred strategy for most patients with severe erosive oesophagitis.  相似文献   
85.
The prevalence of heavy alcohol consumption is a major problem of increasing proportions throughout the world. Although alcohol sensitizing drugs and more recently serotonin uptake inhibitors are drug interventions with some following, their long term beneficial consequences have yet to be demonstrated. In recent years, we have demonstrated that manipulating activity in the renin-angiotensin system will dramatically alter voluntary alcohol consumption in rats. Based on these findings, the present study evaluated the ability of a class of drugs known as the angiotensin converting enzyme inhibitors to reduce voluntary alcohol drinking in laboratory animals. These drugs prevent the conversion of angiotensin I to angiotensin II. They have been licensed for use in Europe and North America and are indicated in the treatment of hypertension. Our experiments showed that both captopril (Capoten, Squibb) and enalapril (Vasotec, Merck Sharpe & Dohme) can reduce alcohol drinking in both normotensive and hypertensive animals regardless of whether the pattern of intake is in a bout or of a less exaggerated nature. Furthermore, this change in alcohol intake can occur without concomitant changes in blood pressure, plasma renin activity, overall fluid balance, or the distribution and metabolism of alcohol. Taken together these findings suggest that the angiotensin converting enzyme inhibitors should be evaluated in a clinical setting for they may prove to be a useful new treatment or treatment adjunct for alcohol abuse in humans.  相似文献   
86.
It has long been noted that tetanus is rare in leprosy patients. Five cases of tetanus are reported in leprosy patients in Addis Ababa, Ethiopia. Although natural immunity to tetanus occurs and this appears to be higher in leprosy patients than in the general population, it is not completely protective. Further research on the relationship between tetanus and leprosy is indicated. Although firm epidemiologic data are lacking, it is prudent to give leprosy patients at least one dose of tetanus toxoid.  相似文献   
87.
88.
Neglected tears of the patellar tendon due to loss of active extension remain a difficult therapeutic endeavor. The goals in the approach to this diagnosis include restoration of both structural and functional integrity of the extensor mechanism. A procedure has been developed utilizing Z-shortening of the patellar tendon, Z-lengthening of the quadriceps tendon, and the semitendinosis gracilis as a biologic splint. This technique allows establishment of preoperative goals, including restoration of the muscle-tendon complex in its anatomic position, restoration of quadriceps function, preservation of vascularity of the reconstructed tendon, and splinting of the patellar tendon. This reconstruction allows early mobilization and rehabilitation.  相似文献   
89.
Computed tomography (CT) is currently the imaging modality of choice for assessing the morphology of the adrenal glands in adult patients. Much useful information can be gained using CT in disease processes which primarily involve one or both of the adrenal glands, such as adenomas, as well as in entities which secondarily affect the adrenals, such as pituitary or metastatic disease. The size and configuration of the glands can be readily determined, and masses may be detected. We discuss CT of normal and abnormal adrenal glands with sonographic (US) and pathological correlation, when available. Entities which may mimic adrenal abnormalities are emphasized. Relative advantages of US over CT in the pediatric patient are discussed.  相似文献   
90.
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