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   3564522篇
  免费   298855篇
  国内免费   16079篇
耳鼻咽喉   48166篇
儿科学   113522篇
妇产科学   92586篇
基础医学   565453篇
口腔科学   95455篇
临床医学   329622篇
内科学   629566篇
皮肤病学   92013篇
神经病学   306688篇
特种医学   138040篇
外国民族医学   392篇
外科学   539935篇
综合类   107492篇
现状与发展   23篇
一般理论   2430篇
预防医学   309926篇
眼科学   81059篇
药学   245607篇
  28篇
中国医学   10620篇
肿瘤学   170833篇
  2021年   55955篇
  2020年   35644篇
  2019年   58780篇
  2018年   72884篇
  2017年   55572篇
  2016年   61181篇
  2015年   75105篇
  2014年   109556篇
  2013年   175505篇
  2012年   105097篇
  2011年   107223篇
  2010年   120869篇
  2009年   123708篇
  2008年   92170篇
  2007年   96334篇
  2006年   106107篇
  2005年   101303篇
  2004年   102365篇
  2003年   92399篇
  2002年   81874篇
  2001年   107996篇
  2000年   101331篇
  1999年   100010篇
  1998年   66030篇
  1997年   63771篇
  1996年   61433篇
  1995年   56996篇
  1994年   51155篇
  1993年   47724篇
  1992年   71103篇
  1991年   68189篇
  1990年   64770篇
  1989年   63130篇
  1988年   58658篇
  1987年   57285篇
  1986年   54665篇
  1985年   54553篇
  1984年   49467篇
  1983年   45065篇
  1982年   42162篇
  1981年   39719篇
  1980年   37352篇
  1979年   40999篇
  1978年   36072篇
  1977年   32595篇
  1976年   30425篇
  1975年   28672篇
  1974年   30186篇
  1973年   29095篇
  1972年   27202篇
排序方式: 共有10000条查询结果,搜索用时 15 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