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   4013870篇
  免费   340543篇
  国内免费   14781篇
耳鼻咽喉   55541篇
儿科学   129132篇
妇产科学   104396篇
基础医学   624947篇
口腔科学   110490篇
临床医学   366782篇
内科学   720976篇
皮肤病学   100568篇
神经病学   340439篇
特种医学   159718篇
外国民族医学   591篇
外科学   614104篇
综合类   121525篇
现状与发展   24篇
一般理论   2501篇
预防医学   341178篇
眼科学   93461篇
药学   279589篇
  25篇
中国医学   10795篇
肿瘤学   192412篇
  2021年   55725篇
  2020年   35507篇
  2019年   58587篇
  2018年   73129篇
  2017年   55852篇
  2016年   61811篇
  2015年   75287篇
  2014年   109767篇
  2013年   175161篇
  2012年   109289篇
  2011年   112385篇
  2010年   121973篇
  2009年   124563篇
  2008年   98782篇
  2007年   104426篇
  2006年   113842篇
  2005年   109109篇
  2004年   110857篇
  2003年   101267篇
  2002年   90238篇
  2001年   141151篇
  2000年   135856篇
  1999年   127317篇
  1998年   69830篇
  1997年   66396篇
  1996年   64545篇
  1995年   60292篇
  1994年   54383篇
  1993年   50518篇
  1992年   93751篇
  1991年   90342篇
  1990年   86392篇
  1989年   84371篇
  1988年   77885篇
  1987年   76702篇
  1986年   72436篇
  1985年   71829篇
  1984年   61539篇
  1983年   54797篇
  1982年   46449篇
  1981年   43367篇
  1980年   40738篇
  1979年   52844篇
  1978年   43955篇
  1977年   38944篇
  1976年   36209篇
  1975年   35489篇
  1974年   38609篇
  1973年   37208篇
  1972年   34570篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
81.
82.
83.
84.
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   
85.
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   
86.
87.
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   
88.
89.
90.
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