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   4342571篇
  免费   353964篇
  国内免费   14734篇
耳鼻咽喉   60488篇
儿科学   135662篇
妇产科学   113808篇
基础医学   662758篇
口腔科学   124021篇
临床医学   388768篇
内科学   785504篇
皮肤病学   107195篇
神经病学   365420篇
特种医学   173811篇
外国民族医学   585篇
外科学   672649篇
综合类   125786篇
现状与发展   23篇
一般理论   2542篇
预防医学   352167篇
眼科学   102550篇
药学   310509篇
  24篇
中国医学   11835篇
肿瘤学   215164篇
  2021年   56112篇
  2019年   58926篇
  2018年   74177篇
  2017年   56740篇
  2016年   63096篇
  2015年   76578篇
  2014年   111045篇
  2013年   176932篇
  2012年   115983篇
  2011年   118943篇
  2010年   124077篇
  2009年   126581篇
  2008年   106467篇
  2007年   112420篇
  2006年   122267篇
  2005年   117519篇
  2004年   119297篇
  2003年   109538篇
  2002年   99492篇
  2001年   160208篇
  2000年   156228篇
  1999年   144966篇
  1998年   71132篇
  1997年   67394篇
  1996年   65341篇
  1995年   60828篇
  1994年   54831篇
  1993年   51053篇
  1992年   107696篇
  1991年   103287篇
  1990年   99268篇
  1989年   97201篇
  1988年   89942篇
  1987年   88248篇
  1986年   83712篇
  1985年   82838篇
  1984年   68665篇
  1983年   61322篇
  1982年   48729篇
  1981年   45236篇
  1980年   42448篇
  1979年   60318篇
  1978年   47973篇
  1977年   42867篇
  1976年   39270篇
  1975年   39322篇
  1974年   43469篇
  1973年   41630篇
  1972年   38994篇
  1971年   36326篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
93.
94.
95.
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   
96.
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   
97.
98.
99.
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   
100.
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