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   3480545篇
  免费   305458篇
  国内免费   13561篇
耳鼻咽喉   47778篇
儿科学   110392篇
妇产科学   90723篇
基础医学   551148篇
口腔科学   95418篇
临床医学   329177篇
内科学   616205篇
皮肤病学   93434篇
神经病学   300249篇
特种医学   135362篇
外国民族医学   288篇
外科学   532279篇
综合类   102477篇
现状与发展   60篇
一般理论   2382篇
预防医学   301073篇
眼科学   79828篇
药学   236444篇
  26篇
中国医学   9355篇
肿瘤学   165466篇
  2021年   55995篇
  2020年   37231篇
  2019年   58768篇
  2018年   74526篇
  2017年   57899篇
  2016年   63455篇
  2015年   77528篇
  2014年   112521篇
  2013年   178123篇
  2012年   96852篇
  2011年   97459篇
  2010年   120173篇
  2009年   125267篇
  2008年   84364篇
  2007年   87479篇
  2006年   97543篇
  2005年   92871篇
  2004年   94050篇
  2003年   84624篇
  2002年   74305篇
  2001年   103175篇
  2000年   95505篇
  1999年   95852篇
  1998年   65485篇
  1997年   63336篇
  1996年   61374篇
  1995年   56699篇
  1994年   50767篇
  1993年   47433篇
  1992年   67755篇
  1991年   64980篇
  1990年   61613篇
  1989年   60704篇
  1988年   56524篇
  1987年   55273篇
  1986年   52698篇
  1985年   52267篇
  1984年   48193篇
  1983年   44365篇
  1982年   41744篇
  1981年   39465篇
  1980年   37174篇
  1979年   40663篇
  1978年   36263篇
  1977年   32848篇
  1976年   30138篇
  1975年   29012篇
  1974年   30493篇
  1973年   29601篇
  1972年   27860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.
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   
96.
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   
97.
98.
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   
99.
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