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   1278797篇
  免费   95279篇
  国内免费   1609篇
耳鼻咽喉   17198篇
儿科学   41477篇
妇产科学   35982篇
基础医学   191111篇
口腔科学   34821篇
临床医学   118591篇
内科学   250774篇
皮肤病学   27448篇
神经病学   103563篇
特种医学   47016篇
外国民族医学   265篇
外科学   179521篇
综合类   25772篇
现状与发展   3篇
一般理论   569篇
预防医学   105741篇
眼科学   28559篇
药学   94831篇
  7篇
中国医学   2057篇
肿瘤学   70379篇
  2018年   14035篇
  2017年   10740篇
  2016年   11697篇
  2015年   13382篇
  2014年   18538篇
  2013年   28293篇
  2012年   38512篇
  2011年   41161篇
  2010年   23684篇
  2009年   22503篇
  2008年   38502篇
  2007年   41459篇
  2006年   41117篇
  2005年   40208篇
  2004年   38736篇
  2003年   37153篇
  2002年   35829篇
  2001年   56370篇
  2000年   57414篇
  1999年   48316篇
  1998年   13467篇
  1997年   12239篇
  1996年   12656篇
  1995年   11928篇
  1994年   11119篇
  1993年   10407篇
  1992年   38210篇
  1991年   37688篇
  1990年   36471篇
  1989年   35269篇
  1988年   32700篇
  1987年   32037篇
  1986年   30539篇
  1985年   28805篇
  1984年   21957篇
  1983年   19210篇
  1982年   11383篇
  1981年   10350篇
  1979年   20973篇
  1978年   15412篇
  1977年   12806篇
  1976年   11858篇
  1975年   12827篇
  1974年   15599篇
  1973年   15369篇
  1972年   14522篇
  1971年   13557篇
  1970年   12790篇
  1969年   12067篇
  1968年   11236篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
53.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  相似文献   
54.
Cell physiology and molecular biology typically follow a reductionistic approach in science. In the last decade, molecular principles and pathogenetic factors involved in the development of many diseases have been successfully discovered. Therefore, early biological concepts based on systemic and cybernetic thoughts have been largely overshadowed by these more recent molecular and pathogenetic factors. This review highlights discoveries on bone development and hypothalamic controlled feeding and eating behavior with a cybernetic and systemic perspective. Interestingly, ancient ideas on bone development and hypothalamic function are still reasonable considerations to embed new molecular discoveries into a systemic concept of principles organizing nature.  相似文献   
55.
56.
57.
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   
58.
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   
59.
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   
60.
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