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   2606418篇
  免费   191105篇
  国内免费   7624篇
耳鼻咽喉   34481篇
儿科学   86178篇
妇产科学   72339篇
基础医学   367054篇
口腔科学   69980篇
临床医学   237649篇
内科学   519435篇
皮肤病学   62875篇
神经病学   216167篇
特种医学   100441篇
外国民族医学   736篇
外科学   388752篇
综合类   50619篇
现状与发展   5篇
一般理论   998篇
预防医学   198792篇
眼科学   56974篇
药学   189502篇
  8篇
中国医学   5376篇
肿瘤学   146786篇
  2021年   20651篇
  2019年   21338篇
  2018年   30095篇
  2017年   23156篇
  2016年   26859篇
  2015年   30136篇
  2014年   41377篇
  2013年   61875篇
  2012年   82257篇
  2011年   86595篇
  2010年   52196篇
  2009年   50097篇
  2008年   80755篇
  2007年   85694篇
  2006年   87341篇
  2005年   83421篇
  2004年   80267篇
  2003年   77459篇
  2002年   74674篇
  2001年   128617篇
  2000年   131522篇
  1999年   110729篇
  1998年   31514篇
  1997年   28164篇
  1996年   28393篇
  1995年   27547篇
  1994年   25196篇
  1993年   23586篇
  1992年   85284篇
  1991年   81672篇
  1990年   78880篇
  1989年   76147篇
  1988年   69555篇
  1987年   68054篇
  1986年   63609篇
  1985年   60582篇
  1984年   45000篇
  1983年   38017篇
  1982年   22515篇
  1981年   20035篇
  1979年   39016篇
  1978年   27483篇
  1977年   23292篇
  1976年   21524篇
  1975年   22845篇
  1974年   26816篇
  1973年   25394篇
  1972年   23782篇
  1971年   21983篇
  1970年   20187篇
排序方式: 共有10000条查询结果,搜索用时 15 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