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   4474009篇
  免费   356605篇
  国内免费   14956篇
耳鼻咽喉   61605篇
儿科学   142861篇
妇产科学   116559篇
基础医学   682512篇
口腔科学   120500篇
临床医学   410101篇
内科学   815300篇
皮肤病学   109447篇
神经病学   380230篇
特种医学   173294篇
外国民族医学   761篇
外科学   673867篇
综合类   123445篇
现状与发展   24篇
一般理论   2839篇
预防医学   372212篇
眼科学   104553篇
药学   316841篇
  29篇
中国医学   12162篇
肿瘤学   226428篇
  2021年   57569篇
  2020年   36686篇
  2019年   60073篇
  2018年   76219篇
  2017年   58359篇
  2016年   64630篇
  2015年   77518篇
  2014年   112331篇
  2013年   178586篇
  2012年   135255篇
  2011年   141398篇
  2010年   129944篇
  2009年   130496篇
  2008年   126322篇
  2007年   134746篇
  2006年   143179篇
  2005年   137190篇
  2004年   137759篇
  2003年   127356篇
  2002年   116045篇
  2001年   167576篇
  2000年   162520篇
  1999年   149241篇
  1998年   72327篇
  1997年   68110篇
  1996年   66047篇
  1995年   61395篇
  1994年   55315篇
  1993年   51296篇
  1992年   106915篇
  1991年   101620篇
  1990年   97465篇
  1989年   95040篇
  1988年   87360篇
  1987年   85561篇
  1986年   80427篇
  1985年   78585篇
  1984年   65660篇
  1983年   58431篇
  1982年   47431篇
  1981年   44096篇
  1980年   41285篇
  1979年   55253篇
  1978年   44910篇
  1977年   40097篇
  1976年   36961篇
  1975年   36908篇
  1974年   39719篇
  1973年   37860篇
  1972年   35473篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
96.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
97.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  相似文献   
98.
99.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
100.
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