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   2718419篇
  免费   191763篇
  国内免费   7927篇
耳鼻咽喉   36229篇
儿科学   90544篇
妇产科学   75796篇
基础医学   381013篇
口腔科学   73802篇
临床医学   245088篇
内科学   538443篇
皮肤病学   65685篇
神经病学   221403篇
特种医学   107387篇
外国民族医学   819篇
外科学   407293篇
综合类   51252篇
现状与发展   5篇
一般理论   969篇
预防医学   207714篇
眼科学   59829篇
药学   197571篇
  10篇
中国医学   5423篇
肿瘤学   151834篇
  2019年   20676篇
  2018年   32218篇
  2017年   25826篇
  2016年   28823篇
  2015年   33432篇
  2014年   43809篇
  2013年   63029篇
  2012年   87756篇
  2011年   87985篇
  2010年   52681篇
  2009年   52009篇
  2008年   80515篇
  2007年   85837篇
  2006年   87739篇
  2005年   90762篇
  2004年   89140篇
  2003年   82673篇
  2002年   75882篇
  2001年   130491篇
  2000年   132139篇
  1999年   113351篇
  1998年   31559篇
  1997年   28072篇
  1996年   28398篇
  1995年   27594篇
  1994年   25254篇
  1993年   23556篇
  1992年   88933篇
  1991年   85745篇
  1990年   83133篇
  1989年   80318篇
  1988年   73483篇
  1987年   71964篇
  1986年   67382篇
  1985年   63854篇
  1984年   47266篇
  1983年   39898篇
  1982年   23117篇
  1981年   20495篇
  1979年   41614篇
  1978年   29043篇
  1977年   24507篇
  1976年   22556篇
  1975年   24550篇
  1974年   29037篇
  1973年   27383篇
  1972年   25774篇
  1971年   23982篇
  1970年   22071篇
  1969年   21277篇
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
71.
72.
73.
74.
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   
75.
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   
76.
77.
78.
79.
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   
80.
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   
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