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   4218245篇
  免费   341278篇
  国内免费   16514篇
耳鼻咽喉   57713篇
儿科学   135416篇
妇产科学   112940篇
基础医学   650738篇
口腔科学   116416篇
临床医学   393561篇
内科学   757311篇
皮肤病学   104211篇
神经病学   356019篇
特种医学   162655篇
外国民族医学   626篇
外科学   629229篇
综合类   123484篇
现状与发展   24篇
一般理论   2614篇
预防医学   365657篇
眼科学   97337篇
药学   293725篇
  31篇
中国医学   11720篇
肿瘤学   204610篇
  2021年   56090篇
  2020年   35715篇
  2019年   58778篇
  2018年   74051篇
  2017年   56609篇
  2016年   62321篇
  2015年   75709篇
  2014年   110174篇
  2013年   175937篇
  2012年   121037篇
  2011年   126114篇
  2010年   125425篇
  2009年   126771篇
  2008年   111337篇
  2007年   118239篇
  2006年   126364篇
  2005年   121594篇
  2004年   122074篇
  2003年   111742篇
  2002年   100984篇
  2001年   143883篇
  2000年   138614篇
  1999年   129993篇
  1998年   69532篇
  1997年   66302篇
  1996年   64351篇
  1995年   59867篇
  1994年   54123篇
  1993年   50305篇
  1992年   95408篇
  1991年   92400篇
  1990年   88493篇
  1989年   85962篇
  1988年   79863篇
  1987年   78261篇
  1986年   74675篇
  1985年   73282篇
  1984年   62621篇
  1983年   56328篇
  1982年   46793篇
  1981年   43769篇
  1980年   41099篇
  1979年   54754篇
  1978年   45305篇
  1977年   39914篇
  1976年   37445篇
  1975年   36809篇
  1974年   40784篇
  1973年   39668篇
  1972年   37231篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
93.
94.
95.
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   
96.
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   
97.
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