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   3365844篇
  免费   255395篇
  国内免费   8835篇
耳鼻咽喉   45584篇
儿科学   110140篇
妇产科学   91840篇
基础医学   474126篇
口腔科学   94304篇
临床医学   309229篇
内科学   662358篇
皮肤病学   77220篇
神经病学   277904篇
特种医学   131131篇
外国民族医学   952篇
外科学   503814篇
综合类   72875篇
现状与发展   5篇
一般理论   1292篇
预防医学   266243篇
眼科学   74831篇
药学   247020篇
  11篇
中国医学   6626篇
肿瘤学   182569篇
  2019年   26150篇
  2018年   36911篇
  2017年   28320篇
  2016年   32612篇
  2015年   36761篇
  2014年   50935篇
  2013年   76946篇
  2012年   101778篇
  2011年   107971篇
  2010年   65060篇
  2009年   62295篇
  2008年   100673篇
  2007年   107179篇
  2006年   109001篇
  2005年   104789篇
  2004年   101020篇
  2003年   97394篇
  2002年   93824篇
  2001年   162049篇
  2000年   166487篇
  1999年   140059篇
  1998年   40438篇
  1997年   35972篇
  1996年   36417篇
  1995年   35402篇
  1994年   32663篇
  1993年   30554篇
  1992年   110390篇
  1991年   106591篇
  1990年   103245篇
  1989年   99395篇
  1988年   91331篇
  1987年   89732篇
  1986年   84437篇
  1985年   80682篇
  1984年   60455篇
  1983年   51162篇
  1982年   30420篇
  1981年   27258篇
  1979年   53939篇
  1978年   38318篇
  1977年   32356篇
  1976年   30034篇
  1975年   32059篇
  1974年   38044篇
  1973年   36292篇
  1972年   33911篇
  1971年   31455篇
  1970年   28945篇
  1969年   27536篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
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   
93.
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   
94.
95.
96.
97.
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   
98.
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   
99.
100.
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