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   1620篇
  免费   129篇
  国内免费   38篇
耳鼻咽喉   37篇
儿科学   151篇
妇产科学   8篇
基础医学   175篇
口腔科学   42篇
临床医学   118篇
内科学   268篇
皮肤病学   12篇
神经病学   90篇
特种医学   119篇
外科学   308篇
综合类   45篇
预防医学   153篇
眼科学   14篇
药学   191篇
肿瘤学   56篇
  2021年   16篇
  2020年   11篇
  2019年   27篇
  2018年   21篇
  2017年   16篇
  2016年   20篇
  2015年   24篇
  2014年   43篇
  2013年   52篇
  2012年   72篇
  2011年   71篇
  2010年   33篇
  2009年   36篇
  2008年   44篇
  2007年   81篇
  2006年   58篇
  2005年   73篇
  2004年   64篇
  2003年   70篇
  2002年   56篇
  2001年   52篇
  2000年   55篇
  1999年   52篇
  1998年   47篇
  1997年   26篇
  1996年   18篇
  1995年   21篇
  1994年   14篇
  1993年   21篇
  1992年   44篇
  1991年   39篇
  1990年   48篇
  1989年   57篇
  1988年   44篇
  1987年   53篇
  1986年   40篇
  1985年   28篇
  1984年   9篇
  1983年   17篇
  1982年   10篇
  1981年   13篇
  1979年   15篇
  1977年   13篇
  1976年   9篇
  1974年   11篇
  1973年   12篇
  1972年   15篇
  1971年   23篇
  1970年   10篇
  1969年   17篇
排序方式: 共有1787条查询结果,搜索用时 0 毫秒
991.
The interval between the onset of symptoms and confirmation of the diagnosis of Crohn's disease in children is often many months or years. A number of factors contribute to this diagnostic delay, but the most significant appear to be delay in the patient seeking initial medical help and failure of the medical practitioner to consider the diagnosis at the time of the first medical contact. In this review of 55 children with Crohn's disease the intervals between onset of symptoms, first presentation and diagnosis were examined and the causes of diagnostic delay determined. The main reason a diagnosis was not made at first presentation was because of ignorance of the fact that Crohn's disease could occur in children. In older children, the combination of tiredness, lethargy and iron deficiency anaemia with vague or intermittent abdominal pain was a frequent cause of diagnostic difficulty. However, even in the absence of major gastrointestinal symptoms, the significance of growth failure and delayed puberty was usually recognised if the patient was referred to a paediatrician. Diagnostic delay could well be reduced if medical practitioners involved in the primary care of children were educated to recognise the various ways in which Crohn's disease presents in this age group. Offprint requests to: S. W. Beasley  相似文献   
992.
The purpose of this study was to investigate the abilities of second-grade and fourth-grade children to auditorially process three orders of three- and five-word sentential approximations, which had normal interstimulus intervals (ISI) and ISIs of 200 and 400 ms. Results showed that percent correct scores decreased as a function of increasing sentence length and ISI, and decreasing order of sentential approximation and grade level. The results are discussed relative to theoretical notions of short-term memory and auditory perceptual processing as well as potential clinical applications.  相似文献   
993.
994.
We describe a patient with trigeminal neurinoma whose main presenting symptom was trismus. This has not previously been reported in the literature. We review the previously described symptoms and signs of trigeminal neurinoma.  相似文献   
995.
996.
997.
A 9 year old girl presenting with multiple glomus tumours is reported. Multiple glomus tumours are rare, often asymptomatic lesions, with a familial tendency and found in a more proximal location than their solitary counterparts. In our report four close relatives had similar lesions. Indications for surgical excision are discussed.  相似文献   
998.
Liver morphology and function were restudied after an interval of 11/2–2 years in 21 Chinese men with hepatitis B antigen (HBsAg). Antigenemia and mild liver histopathology disappeared in one individual who developed antibody to HBsAg (Anti-HBsAg). 20 subjects who were chronic carriers of HBsAg had mild histological abnormalities which were usually persistent and were more commonly lobular than portal. Particularly striking were focal necrosis, eosinophilic bodies, ground-glass cytoplasmic change, and, by electron microscopy, microtubular structures within cytoplasmic membranous cysternae. Interval development of chronic aggressive hepatitis was observed in only one subject. This study suggests that the great majority of HBsAg carriers have a good prognosis at least over a 11/2–2-year period, and that liver biopsy is most indicated in those with persistent liver function abnormalities.  相似文献   
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