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   4064460篇
  免费   307785篇
  国内免费   10193篇
耳鼻咽喉   57464篇
儿科学   130329篇
妇产科学   111148篇
基础医学   568500篇
口腔科学   116923篇
临床医学   374902篇
内科学   788536篇
皮肤病学   91253篇
神经病学   337952篇
特种医学   158562篇
外国民族医学   1438篇
外科学   610100篇
综合类   91146篇
现状与发展   6篇
一般理论   1721篇
预防医学   324949篇
眼科学   94621篇
药学   301275篇
  11篇
中国医学   7983篇
肿瘤学   213619篇
  2018年   43686篇
  2017年   33597篇
  2016年   38179篇
  2015年   43094篇
  2014年   60675篇
  2013年   92116篇
  2012年   122400篇
  2011年   129865篇
  2010年   77875篇
  2009年   74470篇
  2008年   121897篇
  2007年   129483篇
  2006年   131250篇
  2005年   126870篇
  2004年   122274篇
  2003年   117901篇
  2002年   114741篇
  2001年   187070篇
  2000年   192568篇
  1999年   163334篇
  1998年   48504篇
  1997年   43278篇
  1996年   42926篇
  1995年   41626篇
  1994年   38647篇
  1993年   36153篇
  1992年   129780篇
  1991年   125543篇
  1990年   121350篇
  1989年   117257篇
  1988年   108381篇
  1987年   106759篇
  1986年   100831篇
  1985年   96592篇
  1984年   72650篇
  1983年   62036篇
  1982年   37357篇
  1981年   33623篇
  1979年   66753篇
  1978年   47238篇
  1977年   40027篇
  1976年   37496篇
  1975年   39603篇
  1974年   47989篇
  1973年   45815篇
  1972年   43111篇
  1971年   39925篇
  1970年   37311篇
  1969年   35277篇
  1968年   32451篇
排序方式: 共有10000条查询结果,搜索用时 550 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