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   1406435篇
  免费   101114篇
  国内免费   2014篇
耳鼻咽喉   18411篇
儿科学   45453篇
妇产科学   38967篇
基础医学   208592篇
口腔科学   38911篇
临床医学   127562篇
内科学   280231篇
皮肤病学   31872篇
神经病学   113699篇
特种医学   50071篇
外国民族医学   295篇
外科学   196422篇
综合类   26532篇
现状与发展   3篇
一般理论   604篇
预防医学   119490篇
眼科学   30942篇
药学   102701篇
  7篇
中国医学   2482篇
肿瘤学   76316篇
  2021年   12711篇
  2019年   13224篇
  2018年   17836篇
  2017年   13185篇
  2016年   14072篇
  2015年   16147篇
  2014年   22024篇
  2013年   33410篇
  2012年   46613篇
  2011年   49139篇
  2010年   28164篇
  2009年   26594篇
  2008年   45205篇
  2007年   48211篇
  2006年   47636篇
  2005年   46737篇
  2004年   44613篇
  2003年   42515篇
  2002年   41104篇
  2001年   59808篇
  2000年   60905篇
  1999年   51402篇
  1998年   14425篇
  1997年   12976篇
  1996年   13322篇
  1995年   12502篇
  1994年   11610篇
  1992年   39865篇
  1991年   39291篇
  1990年   37992篇
  1989年   36570篇
  1988年   33926篇
  1987年   33251篇
  1986年   31682篇
  1985年   29864篇
  1984年   22773篇
  1983年   19852篇
  1982年   11790篇
  1979年   21739篇
  1978年   15932篇
  1977年   13245篇
  1976年   12295篇
  1975年   13364篇
  1974年   16293篇
  1973年   16058篇
  1972年   15106篇
  1971年   14094篇
  1970年   13394篇
  1969年   12644篇
  1968年   11778篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
The absence of the temporary incisors could be to a genetic illness or to some multiple premature extractions. These extractions are the aftermaths of the carious lesions or some traumatisms underwent by the temporary incisors. Beyond measure the loss of the space, the premature loss some temporary incisors very often assign the relational development of the child and disturb its psychological development and the aesthetic function. Across some cases clinics, the authors show that the replacement of the temporary incisors is the therapeutic ideal solution. Indeed, the child prosthesis, replacing the temporary absent incisors, solves the psychological, aesthetic and relational problems of the child.  相似文献   
75.
Contour defects resulting in deformity caused by lack of tissue can be improved by conventional surgery using autologous tissue, but there is always a donor site morbidity. Integra has been available since the early 1980's for use in acute burns and more recently in reconstruction. It has been shown histologically to act as a tissue regeneration template. The regenerated dermis is buried under an autologous thin split-skin graft. In this study, the principle of burying Integra (without the silicone layer) has been applied to deep tissue defects in 12 reconstructive cases. Such regenerated tissues survive at least 3 years after burying. Modification to the technique to avoid visible edges are being developed.  相似文献   
76.
Summary The third-stage larvae of Daniconema anguillae Moravec et K?ie, 1987 are found in the eels fins caught from Dringis Lake (Lithuanian National park). The morphology of these larvae is briefly described.  相似文献   
77.
78.
OBJECTIVE: To evaluate the effect of statins on aneurysm growth in a group of consecutive patients under surveillance for infrarenal aortic aneurysms (AAA). MATERIALS AND METHODS: All patients (59 statin users, 91 non-users) under surveillance between January 2002 and August 2005 with a follow-up for aneurysm growth of at least 12 months and a minimum of three diameter evaluations were retrospectively included in the analysis. Multiple regression analysis, weighted with the number of observations, was performed to test the influence of statins on AAA growth rate. RESULTS: During a median period of 3.1 (1.1-13.1) years the overall mean aneurysm growth rate was 2.95+/-2.8 mm/year. Statin users had a 1.16 mm/year lower AAA growth rate compared to non-users (95% CI 0.33-1.99 mm/year). Increased age was associated with a slower growth (-0.09 mm/year per year, p = 0.003). Female gender (+1.82 mm/year, p = 0.008) and aneurysm diameter (+0.06 mm/year per mm, p = 0.049) were associated with increased AAA growth. The use of non-steroidal anti-inflammatory drugs, chronic lung disease, or other cardiovascular risk factors were not independently associated with AAA growth. CONCLUSIONS: Statins appear to be associated with attenuation of AAA growth, irrespective of other known factors influencing aneurysm growth.  相似文献   
79.
80.
目的:通过16例经内窥镜及病理证实为Barrett食管的钡餐检查表现,初步探讨Barrett食管及其并发症放射学检查的意义。方法:回顾性分析16例Barrett食管的内窥镜和气钡检查的记录及表现,着重探讨气钡检查的X线表现。结果:食管内窥镜和组织学检查全部病例均有炎症改变,其他可见胃食管反流、食管溃疡和食管腺癌。放射学钡餐检查结果:Barrett食管炎4例,Barrett食管溃疡7例,Barrett食管癌5例。结论:Barrett食管及其并发症至今无明确放射学征象,改进对“Z”线的检查技术和方法,有可能提高其发现率。钡餐发现胃食管反流、食管裂孔疝同时并发食管炎、食管溃疡及食管癌者均应考虑到本症的可能。  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