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   3265305篇
  免费   232031篇
  国内免费   8450篇
耳鼻咽喉   44969篇
儿科学   108282篇
妇产科学   90548篇
基础医学   460105篇
口腔科学   89776篇
临床医学   297527篇
内科学   635627篇
皮肤病学   78199篇
神经病学   264933篇
特种医学   126057篇
外国民族医学   918篇
外科学   487615篇
综合类   65832篇
现状与发展   7篇
一般理论   1189篇
预防医学   247006篇
眼科学   74065篇
药学   244267篇
  13篇
中国医学   7113篇
肿瘤学   181738篇
  2019年   25739篇
  2018年   36336篇
  2017年   28062篇
  2016年   32463篇
  2015年   36427篇
  2014年   49972篇
  2013年   74796篇
  2012年   99815篇
  2011年   105440篇
  2010年   63441篇
  2009年   60587篇
  2008年   98235篇
  2007年   104497篇
  2006年   106314篇
  2005年   101985篇
  2004年   98015篇
  2003年   94540篇
  2002年   91248篇
  2001年   159494篇
  2000年   163553篇
  1999年   137671篇
  1998年   38998篇
  1997年   34587篇
  1996年   34792篇
  1995年   33612篇
  1994年   30608篇
  1993年   28719篇
  1992年   106496篇
  1991年   102527篇
  1990年   99703篇
  1989年   96457篇
  1988年   88130篇
  1987年   86105篇
  1986年   81003篇
  1985年   77087篇
  1984年   57229篇
  1983年   48217篇
  1982年   28397篇
  1981年   25178篇
  1979年   50629篇
  1978年   35309篇
  1977年   30659篇
  1976年   27853篇
  1975年   30181篇
  1974年   35452篇
  1973年   33799篇
  1972年   31907篇
  1971年   29686篇
  1970年   27280篇
  1969年   26276篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
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   
82.
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   
83.
84.
85.
86.
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   
87.
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   
88.
89.
90.
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