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   4347077篇
  免费   348931篇
  国内免费   14683篇
耳鼻咽喉   60300篇
儿科学   139403篇
妇产科学   114203篇
基础医学   666523篇
口腔科学   117968篇
临床医学   396871篇
内科学   790247篇
皮肤病学   107737篇
神经病学   368187篇
特种医学   169465篇
外国民族医学   753篇
外科学   656073篇
综合类   121264篇
现状与发展   24篇
一般理论   2614篇
预防医学   360295篇
眼科学   100877篇
药学   307528篇
  26篇
中国医学   11934篇
肿瘤学   218399篇
  2021年   56132篇
  2020年   35804篇
  2019年   58786篇
  2018年   74350篇
  2017年   56982篇
  2016年   63083篇
  2015年   76048篇
  2014年   110252篇
  2013年   175771篇
  2012年   124177篇
  2011年   128888篇
  2010年   125849篇
  2009年   127580篇
  2008年   115119篇
  2007年   122387篇
  2006年   131211篇
  2005年   125279篇
  2004年   126590篇
  2003年   116808篇
  2002年   106049篇
  2001年   166933篇
  2000年   162015篇
  1999年   148677篇
  1998年   71661篇
  1997年   67604篇
  1996年   65623篇
  1995年   61050篇
  1994年   54969篇
  1993年   51014篇
  1992年   106619篇
  1991年   101386篇
  1990年   97246篇
  1989年   94818篇
  1988年   87144篇
  1987年   85309篇
  1986年   80194篇
  1985年   78351篇
  1984年   65398篇
  1983年   58198篇
  1982年   47189篇
  1981年   43856篇
  1980年   41072篇
  1979年   55107篇
  1978年   44754篇
  1977年   39979篇
  1976年   36837篇
  1975年   36805篇
  1974年   39611篇
  1973年   37752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