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   2724136篇
  免费   192109篇
  国内免费   7958篇
耳鼻咽喉   36246篇
儿科学   90690篇
妇产科学   75910篇
基础医学   381818篇
口腔科学   73885篇
临床医学   245769篇
内科学   539931篇
皮肤病学   65813篇
神经病学   221963篇
特种医学   107482篇
外国民族医学   819篇
外科学   407804篇
综合类   51279篇
现状与发展   5篇
一般理论   970篇
预防医学   208269篇
眼科学   59924篇
药学   197835篇
  10篇
中国医学   5428篇
肿瘤学   152353篇
  2019年   20789篇
  2018年   32349篇
  2017年   25932篇
  2016年   28962篇
  2015年   33597篇
  2014年   43972篇
  2013年   63268篇
  2012年   88089篇
  2011年   88355篇
  2010年   52890篇
  2009年   52211篇
  2008年   80807篇
  2007年   86104篇
  2006年   87990篇
  2005年   90988篇
  2004年   89333篇
  2003年   82817篇
  2002年   76025篇
  2001年   130501篇
  2000年   132135篇
  1999年   113371篇
  1998年   31595篇
  1997年   28104篇
  1996年   28418篇
  1995年   27617篇
  1994年   25269篇
  1993年   23574篇
  1992年   88940篇
  1991年   85758篇
  1990年   83138篇
  1989年   80329篇
  1988年   73492篇
  1987年   71968篇
  1986年   67387篇
  1985年   63861篇
  1984年   47265篇
  1983年   39903篇
  1982年   23121篇
  1981年   20496篇
  1979年   41623篇
  1978年   29039篇
  1977年   24509篇
  1976年   22553篇
  1975年   24545篇
  1974年   29035篇
  1973年   27382篇
  1972年   25776篇
  1971年   23984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 15 毫秒
71.
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   
72.
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   
73.
74.
75.
76.
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   
77.
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   
78.
79.
80.
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