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   4347804篇
  免费   348719篇
  国内免费   14684篇
耳鼻咽喉   60314篇
儿科学   139465篇
妇产科学   114221篇
基础医学   666632篇
口腔科学   117968篇
临床医学   396936篇
内科学   790284篇
皮肤病学   107726篇
神经病学   368269篇
特种医学   169450篇
外国民族医学   753篇
外科学   656047篇
综合类   121271篇
现状与发展   24篇
一般理论   2616篇
预防医学   360387篇
眼科学   100892篇
药学   307595篇
  26篇
中国医学   11935篇
肿瘤学   218396篇
  2021年   56146篇
  2020年   35822篇
  2019年   58806篇
  2018年   74375篇
  2017年   56991篇
  2016年   63107篇
  2015年   76061篇
  2014年   110269篇
  2013年   175813篇
  2012年   124249篇
  2011年   128946篇
  2010年   125870篇
  2009年   127590篇
  2008年   115174篇
  2007年   122424篇
  2006年   131229篇
  2005年   125312篇
  2004年   126630篇
  2003年   116835篇
  2002年   106083篇
  2001年   166937篇
  2000年   162015篇
  1999年   148667篇
  1998年   71659篇
  1997年   67606篇
  1996年   65622篇
  1995年   61045篇
  1994年   54968篇
  1993年   51010篇
  1992年   106613篇
  1991年   101377篇
  1990年   97242篇
  1989年   94811篇
  1988年   87137篇
  1987年   85304篇
  1986年   80196篇
  1985年   78349篇
  1984年   65393篇
  1983年   58197篇
  1982年   47187篇
  1981年   43855篇
  1980年   41073篇
  1979年   55100篇
  1978年   44752篇
  1977年   39978篇
  1976年   36836篇
  1975年   36805篇
  1974年   39608篇
  1973年   37750篇
  1972年   35358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.
96.
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   
97.
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   
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