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   2588127篇
  免费   189704篇
  国内免费   7576篇
耳鼻咽喉   34357篇
儿科学   85610篇
妇产科学   71711篇
基础医学   364619篇
口腔科学   69725篇
临床医学   234592篇
内科学   516017篇
皮肤病学   62646篇
神经病学   213714篇
特种医学   100059篇
外国民族医学   737篇
外科学   386957篇
综合类   50700篇
现状与发展   5篇
一般理论   974篇
预防医学   196238篇
眼科学   56976篇
药学   188637篇
  8篇
中国医学   5391篇
肿瘤学   145734篇
  2021年   20263篇
  2019年   20795篇
  2018年   29511篇
  2017年   22759篇
  2016年   26429篇
  2015年   29728篇
  2014年   40750篇
  2013年   60832篇
  2012年   80775篇
  2011年   85081篇
  2010年   51331篇
  2009年   49412篇
  2008年   79435篇
  2007年   84287篇
  2006年   85993篇
  2005年   82106篇
  2004年   79040篇
  2003年   76329篇
  2002年   73604篇
  2001年   128573篇
  2000年   131494篇
  1999年   110635篇
  1998年   31308篇
  1997年   27964篇
  1996年   28265篇
  1995年   27424篇
  1994年   25095篇
  1993年   23451篇
  1992年   85254篇
  1991年   81664篇
  1990年   78855篇
  1989年   76138篇
  1988年   69568篇
  1987年   68068篇
  1986年   63615篇
  1985年   60588篇
  1984年   45002篇
  1983年   37993篇
  1982年   22488篇
  1981年   19995篇
  1979年   38999篇
  1978年   27486篇
  1977年   23287篇
  1976年   21537篇
  1975年   22845篇
  1974年   26830篇
  1973年   25398篇
  1972年   23767篇
  1971年   21984篇
  1970年   20197篇
排序方式: 共有10000条查询结果,搜索用时 171 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