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   4064035篇
  免费   307782篇
  国内免费   10196篇
耳鼻咽喉   57473篇
儿科学   130326篇
妇产科学   111140篇
基础医学   568444篇
口腔科学   116921篇
临床医学   374918篇
内科学   788441篇
皮肤病学   91242篇
神经病学   337937篇
特种医学   158557篇
外国民族医学   1438篇
外科学   609950篇
综合类   91166篇
现状与发展   6篇
一般理论   1724篇
预防医学   324891篇
眼科学   94660篇
药学   301251篇
  11篇
中国医学   7985篇
肿瘤学   213532篇
  2018年   43673篇
  2017年   33604篇
  2016年   38176篇
  2015年   43102篇
  2014年   60669篇
  2013年   92101篇
  2012年   122402篇
  2011年   129876篇
  2010年   77886篇
  2009年   74462篇
  2008年   121893篇
  2007年   129475篇
  2006年   131205篇
  2005年   126848篇
  2004年   122249篇
  2003年   117848篇
  2002年   114703篇
  2001年   187052篇
  2000年   192542篇
  1999年   163300篇
  1998年   48485篇
  1997年   43270篇
  1996年   42908篇
  1995年   41619篇
  1994年   38635篇
  1993年   36155篇
  1992年   129760篇
  1991年   125530篇
  1990年   121339篇
  1989年   117252篇
  1988年   108363篇
  1987年   106752篇
  1986年   100824篇
  1985年   96581篇
  1984年   72650篇
  1983年   62037篇
  1982年   37358篇
  1981年   33620篇
  1979年   66751篇
  1978年   47241篇
  1977年   40025篇
  1976年   37494篇
  1975年   39596篇
  1974年   47990篇
  1973年   45812篇
  1972年   43108篇
  1971年   39924篇
  1970年   37307篇
  1969年   35274篇
  1968年   32452篇
排序方式: 共有10000条查询结果,搜索用时 879 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