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   4368024篇
  免费   369089篇
  国内免费   14757篇
耳鼻咽喉   60821篇
儿科学   140260篇
妇产科学   115482篇
基础医学   668311篇
口腔科学   123055篇
临床医学   396798篇
内科学   792139篇
皮肤病学   105894篇
神经病学   369197篇
特种医学   175491篇
外国民族医学   742篇
外科学   667043篇
综合类   131966篇
现状与发展   24篇
一般理论   2605篇
预防医学   368563篇
眼科学   102249篇
药学   308837篇
  24篇
中国医学   11442篇
肿瘤学   210927篇
  2021年   55903篇
  2019年   58603篇
  2018年   73610篇
  2017年   56215篇
  2016年   62310篇
  2015年   75661篇
  2014年   110192篇
  2013年   175437篇
  2012年   117224篇
  2011年   121184篇
  2010年   123932篇
  2009年   126078篇
  2008年   108192篇
  2007年   114690篇
  2006年   124046篇
  2005年   119019篇
  2004年   121023篇
  2003年   111076篇
  2002年   100089篇
  2001年   159725篇
  2000年   155675篇
  1999年   143576篇
  1998年   71890篇
  1997年   68048篇
  1996年   66333篇
  1995年   62038篇
  1994年   56079篇
  1993年   52222篇
  1992年   108345篇
  1991年   104482篇
  1990年   100214篇
  1989年   97600篇
  1988年   90690篇
  1987年   89024篇
  1986年   84575篇
  1985年   83433篇
  1984年   69715篇
  1983年   61902篇
  1982年   49369篇
  1981年   45829篇
  1980年   43151篇
  1979年   61693篇
  1978年   49341篇
  1977年   43456篇
  1976年   40509篇
  1975年   40144篇
  1974年   44871篇
  1973年   43202篇
  1972年   40211篇
  1971年   37256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