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   3558047篇
  免费   306225篇
  国内免费   14309篇
耳鼻咽喉   48225篇
儿科学   113790篇
妇产科学   93072篇
基础医学   565283篇
口腔科学   94501篇
临床医学   320832篇
内科学   637137篇
皮肤病学   93827篇
神经病学   307133篇
特种医学   138899篇
外国民族医学   491篇
外科学   546201篇
综合类   108421篇
现状与发展   24篇
一般理论   2363篇
预防医学   299781篇
眼科学   81844篇
药学   244402篇
  24篇
中国医学   10606篇
肿瘤学   171725篇
  2021年   55610篇
  2020年   35462篇
  2019年   58550篇
  2018年   72170篇
  2017年   55169篇
  2016年   60963篇
  2015年   74815篇
  2014年   109180篇
  2013年   174426篇
  2012年   101784篇
  2011年   102744篇
  2010年   119019篇
  2009年   123094篇
  2008年   89076篇
  2007年   93005篇
  2006年   103242篇
  2005年   98501篇
  2004年   99720篇
  2003年   89971篇
  2002年   79283篇
  2001年   118731篇
  2000年   112117篇
  1999年   108003篇
  1998年   66832篇
  1997年   64380篇
  1996年   62200篇
  1995年   57635篇
  1994年   51559篇
  1993年   48143篇
  1992年   74509篇
  1991年   70166篇
  1990年   65880篇
  1989年   64630篇
  1988年   59606篇
  1987年   58311篇
  1986年   54799篇
  1985年   54622篇
  1984年   49663篇
  1983年   45211篇
  1982年   42262篇
  1981年   39616篇
  1980年   37310篇
  1979年   40345篇
  1978年   35631篇
  1977年   32348篇
  1976年   29679篇
  1975年   27986篇
  1974年   29076篇
  1973年   28090篇
  1972年   26281篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
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   
84.
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   
85.
86.
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   
87.
88.
89.
90.
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