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   3501695篇
  免费   250360篇
  国内免费   9426篇
耳鼻咽喉   49601篇
儿科学   114146篇
妇产科学   99143篇
基础医学   493208篇
口腔科学   100124篇
临床医学   315314篇
内科学   682850篇
皮肤病学   83874篇
神经病学   287673篇
特种医学   135716篇
外国民族医学   1122篇
外科学   527265篇
综合类   73144篇
现状与发展   11篇
一般理论   1332篇
预防医学   261587篇
眼科学   80942篇
药学   258021篇
  12篇
中国医学   7227篇
肿瘤学   189169篇
  2018年   37870篇
  2017年   29511篇
  2016年   34138篇
  2015年   37817篇
  2014年   51818篇
  2013年   78894篇
  2012年   103991篇
  2011年   110480篇
  2010年   66397篇
  2009年   62813篇
  2008年   104130篇
  2007年   111453篇
  2006年   112677篇
  2005年   108564篇
  2004年   104742篇
  2003年   101599篇
  2002年   98378篇
  2001年   162595篇
  2000年   167096篇
  1999年   140844篇
  1998年   40750篇
  1997年   36344篇
  1996年   35858篇
  1995年   34573篇
  1994年   31899篇
  1993年   29920篇
  1992年   109406篇
  1991年   105597篇
  1990年   102596篇
  1989年   99535篇
  1988年   91768篇
  1987年   90029篇
  1986年   85021篇
  1985年   81427篇
  1984年   61092篇
  1983年   51875篇
  1982年   31233篇
  1981年   27958篇
  1979年   55481篇
  1978年   39472篇
  1977年   34057篇
  1976年   31251篇
  1975年   34228篇
  1974年   40311篇
  1973年   38676篇
  1972年   36497篇
  1971年   34079篇
  1970年   31793篇
  1969年   30659篇
  1968年   28457篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
94.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
95.
96.
97.
98.
Pediatric trachyonychia is an acquired nail disease that can cause distress to families. It is a poorly understood disease, and long‐term follow‐up data are lacking. We present an institutional review of 11 children with isolated pediatric trachyonychia followed over time. Children with the diagnosis of pediatric trachyonychia were identified and invited to participate. Pictures were taken on follow‐up and a questionnaire was answered. Exclusion criteria include having another diagnosis at the initial visit that causes nail dystrophy. Eleven patients with the diagnosis of pediatric trachyonychia were available for follow‐up. The mean age of appearance was 2.7 years (range 2–7 yrs) and the average follow‐up was 66 months (range 10–126 mos). Nine patients were treated with potent topical corticosteroids, one used only petrolatum, and one took vitamin supplements. One patient was found to have an additional skin and hair diagnosis of alopecia areata on follow‐up. On follow‐up, 82% noted improvement of the nails, whereas 18% noted no change. A majority of cases of pediatric trachyonychia are isolated and improve with time, regardless of treatment.  相似文献   
99.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  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