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   4270540篇
  免费   360191篇
  国内免费   15249篇
耳鼻咽喉   60913篇
儿科学   132970篇
妇产科学   111760篇
基础医学   654991篇
口腔科学   118761篇
临床医学   387921篇
内科学   775239篇
皮肤病学   103260篇
神经病学   366712篇
特种医学   170583篇
外国民族医学   912篇
外科学   651930篇
综合类   126127篇
现状与发展   23篇
一般理论   2586篇
预防医学   362569篇
眼科学   100508篇
药学   301969篇
  24篇
中国医学   11361篇
肿瘤学   204861篇
  2021年   55640篇
  2020年   35468篇
  2019年   58586篇
  2018年   73164篇
  2017年   55886篇
  2016年   62195篇
  2015年   75499篇
  2014年   110211篇
  2013年   175529篇
  2012年   117415篇
  2011年   120457篇
  2010年   122833篇
  2009年   125990篇
  2008年   107663篇
  2007年   114173篇
  2006年   123707篇
  2005年   118876篇
  2004年   119821篇
  2003年   110550篇
  2002年   101180篇
  2001年   154364篇
  2000年   150564篇
  1999年   139612篇
  1998年   71293篇
  1997年   67764篇
  1996年   65660篇
  1995年   61518篇
  1994年   55575篇
  1993年   51620篇
  1992年   103637篇
  1991年   99040篇
  1990年   94170篇
  1989年   91740篇
  1988年   85376篇
  1987年   83838篇
  1986年   79510篇
  1985年   77957篇
  1984年   65972篇
  1983年   58876篇
  1982年   48150篇
  1981年   44893篇
  1980年   42171篇
  1979年   57858篇
  1978年   47057篇
  1977年   41610篇
  1976年   38665篇
  1975年   37863篇
  1974年   42436篇
  1973年   40566篇
  1972年   38041篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
81.
82.
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   
83.
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   
84.
85.
86.
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   
87.
88.
89.
90.
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