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   4347589篇
  免费   348954篇
  国内免费   14683篇
耳鼻咽喉   60303篇
儿科学   139417篇
妇产科学   114216篇
基础医学   666601篇
口腔科学   117975篇
临床医学   396945篇
内科学   790296篇
皮肤病学   107794篇
神经病学   368220篇
特种医学   169441篇
外国民族医学   753篇
外科学   656114篇
综合类   121281篇
现状与发展   24篇
一般理论   2615篇
预防医学   360413篇
眼科学   100880篇
药学   307562篇
  26篇
中国医学   11934篇
肿瘤学   218416篇
  2021年   56144篇
  2020年   35804篇
  2019年   58798篇
  2018年   74375篇
  2017年   56981篇
  2016年   63100篇
  2015年   76055篇
  2014年   110257篇
  2013年   175783篇
  2012年   124231篇
  2011年   128965篇
  2010年   125856篇
  2009年   127579篇
  2008年   115172篇
  2007年   122442篇
  2006年   131274篇
  2005年   125331篇
  2004年   126649篇
  2003年   116847篇
  2002年   106083篇
  2001年   166937篇
  2000年   162011篇
  1999年   148673篇
  1998年   71655篇
  1997年   67603篇
  1996年   65621篇
  1995年   61041篇
  1994年   54966篇
  1993年   51009篇
  1992年   106615篇
  1991年   101379篇
  1990年   97241篇
  1989年   94814篇
  1988年   87140篇
  1987年   85311篇
  1986年   80193篇
  1985年   78352篇
  1984年   65396篇
  1983年   58195篇
  1982年   47190篇
  1981年   43860篇
  1980年   41073篇
  1979年   55100篇
  1978年   44752篇
  1977年   39979篇
  1976年   36838篇
  1975年   36804篇
  1974年   39611篇
  1973年   37750篇
  1972年   35359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.
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