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   4065159篇
  免费   307812篇
  国内免费   10203篇
耳鼻咽喉   57475篇
儿科学   130379篇
妇产科学   111165篇
基础医学   568504篇
口腔科学   116976篇
临床医学   375060篇
内科学   788686篇
皮肤病学   91244篇
神经病学   338032篇
特种医学   158575篇
外国民族医学   1438篇
外科学   610155篇
综合类   91172篇
现状与发展   6篇
一般理论   1723篇
预防医学   325021篇
眼科学   94679篇
药学   301281篇
  11篇
中国医学   7984篇
肿瘤学   213608篇
  2018年   43688篇
  2017年   33614篇
  2016年   38170篇
  2015年   43092篇
  2014年   60687篇
  2013年   92158篇
  2012年   122415篇
  2011年   129903篇
  2010年   77905篇
  2009年   74465篇
  2008年   121900篇
  2007年   129495篇
  2006年   131242篇
  2005年   126892篇
  2004年   122289篇
  2003年   117879篇
  2002年   114732篇
  2001年   187073篇
  2000年   192565篇
  1999年   163320篇
  1998年   48501篇
  1997年   43277篇
  1996年   42928篇
  1995年   41633篇
  1994年   38662篇
  1993年   36161篇
  1992年   129785篇
  1991年   125558篇
  1990年   121365篇
  1989年   117277篇
  1988年   108393篇
  1987年   106781篇
  1986年   100851篇
  1985年   96614篇
  1984年   72662篇
  1983年   62045篇
  1982年   37372篇
  1981年   33622篇
  1979年   66773篇
  1978年   47245篇
  1977年   40039篇
  1976年   37523篇
  1975年   39613篇
  1974年   48002篇
  1973年   45821篇
  1972年   43125篇
  1971年   39944篇
  1970年   37320篇
  1969年   35281篇
  1968年   32464篇
排序方式: 共有10000条查询结果,搜索用时 15 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