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   4064216篇
  免费   307926篇
  国内免费   10199篇
耳鼻咽喉   57612篇
儿科学   130377篇
妇产科学   111180篇
基础医学   568516篇
口腔科学   116983篇
临床医学   374831篇
内科学   788242篇
皮肤病学   91275篇
神经病学   338113篇
特种医学   158602篇
外国民族医学   1438篇
外科学   610036篇
综合类   91145篇
现状与发展   6篇
一般理论   1729篇
预防医学   324767篇
眼科学   94646篇
药学   301317篇
  11篇
中国医学   7984篇
肿瘤学   213531篇
  2018年   43716篇
  2017年   33630篇
  2016年   38192篇
  2015年   43122篇
  2014年   60683篇
  2013年   92176篇
  2012年   122459篇
  2011年   129977篇
  2010年   77937篇
  2009年   74522篇
  2008年   121970篇
  2007年   129575篇
  2006年   131305篇
  2005年   126970篇
  2004年   122359篇
  2003年   117953篇
  2002年   114789篇
  2001年   187108篇
  2000年   192628篇
  1999年   163374篇
  1998年   48541篇
  1997年   43311篇
  1996年   42926篇
  1995年   41648篇
  1994年   38658篇
  1993年   36177篇
  1992年   129802篇
  1991年   125574篇
  1990年   121416篇
  1989年   117307篇
  1988年   108422篇
  1987年   106794篇
  1986年   100879篇
  1985年   96622篇
  1984年   72671篇
  1983年   62067篇
  1982年   37375篇
  1981年   33644篇
  1979年   66779篇
  1978年   47257篇
  1977年   40059篇
  1976年   37516篇
  1975年   39620篇
  1974年   48006篇
  1973年   45804篇
  1972年   43091篇
  1971年   39914篇
  1970年   37277篇
  1969年   35243篇
  1968年   32433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