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   3413138篇
  免费   248910篇
  国内免费   10807篇
耳鼻咽喉   45587篇
儿科学   112196篇
妇产科学   94449篇
基础医学   484043篇
口腔科学   94323篇
临床医学   320068篇
内科学   665437篇
皮肤病学   78088篇
神经病学   283136篇
特种医学   129045篇
外国民族医学   1047篇
外科学   499451篇
综合类   71981篇
现状与发展   6篇
一般理论   1343篇
预防医学   272563篇
眼科学   76551篇
药学   250028篇
  12篇
中国医学   7483篇
肿瘤学   186018篇
  2019年   27656篇
  2018年   38868篇
  2017年   29652篇
  2016年   33903篇
  2015年   38287篇
  2014年   52767篇
  2013年   80418篇
  2012年   107508篇
  2011年   113802篇
  2010年   68263篇
  2009年   64670篇
  2008年   105761篇
  2007年   111991篇
  2006年   113641篇
  2005年   109082篇
  2004年   104652篇
  2003年   100904篇
  2002年   97532篇
  2001年   159182篇
  2000年   163392篇
  1999年   137950篇
  1998年   40256篇
  1997年   35761篇
  1996年   35758篇
  1995年   34508篇
  1994年   31860篇
  1993年   29964篇
  1992年   108312篇
  1991年   104736篇
  1990年   101561篇
  1989年   97726篇
  1988年   89775篇
  1987年   88040篇
  1986年   83026篇
  1985年   79334篇
  1984年   59332篇
  1983年   50647篇
  1982年   30174篇
  1981年   26905篇
  1979年   52948篇
  1978年   37601篇
  1977年   31532篇
  1976年   29783篇
  1975年   31365篇
  1974年   37424篇
  1973年   35830篇
  1972年   33481篇
  1971年   31152篇
  1970年   28837篇
  1969年   27303篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
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   
83.
84.
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   
85.
86.
87.
88.
89.
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   
90.
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