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   4063135篇
  免费   307698篇
  国内免费   10192篇
耳鼻咽喉   57459篇
儿科学   130304篇
妇产科学   111111篇
基础医学   568286篇
口腔科学   116915篇
临床医学   374828篇
内科学   788265篇
皮肤病学   91227篇
神经病学   337854篇
特种医学   158516篇
外国民族医学   1438篇
外科学   609892篇
综合类   91144篇
现状与发展   6篇
一般理论   1720篇
预防医学   324824篇
眼科学   94616篇
药学   301159篇
  11篇
中国医学   7981篇
肿瘤学   213469篇
  2018年   43653篇
  2017年   33582篇
  2016年   38153篇
  2015年   43068篇
  2014年   60636篇
  2013年   92066篇
  2012年   122335篇
  2011年   129812篇
  2010年   77843篇
  2009年   74423篇
  2008年   121828篇
  2007年   129407篇
  2006年   131167篇
  2005年   126808篇
  2004年   122205篇
  2003年   117815篇
  2002年   114658篇
  2001年   187045篇
  2000年   192537篇
  1999年   163298篇
  1998年   48484篇
  1997年   43265篇
  1996年   42903篇
  1995年   41613篇
  1994年   38636篇
  1993年   36149篇
  1992年   129755篇
  1991年   125527篇
  1990年   121333篇
  1989年   117243篇
  1988年   108363篇
  1987年   106746篇
  1986年   100819篇
  1985年   96581篇
  1984年   72640篇
  1983年   62033篇
  1982年   37355篇
  1981年   33615篇
  1979年   66747篇
  1978年   47234篇
  1977年   40024篇
  1976年   37492篇
  1975年   39595篇
  1974年   47992篇
  1973年   45811篇
  1972年   43107篇
  1971年   39924篇
  1970年   37309篇
  1969年   35274篇
  1968年   32453篇
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
51.
52.
53.
54.
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   
55.
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   
56.
57.
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   
58.
59.
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