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   2585436篇
  免费   189443篇
  国内免费   7567篇
耳鼻咽喉   34300篇
儿科学   85253篇
妇产科学   71668篇
基础医学   363826篇
口腔科学   69691篇
临床医学   234773篇
内科学   516011篇
皮肤病学   62488篇
神经病学   213630篇
特种医学   99916篇
外国民族医学   737篇
外科学   386765篇
综合类   50414篇
现状与发展   5篇
一般理论   969篇
预防医学   196322篇
眼科学   56699篇
药学   188069篇
  8篇
中国医学   5333篇
肿瘤学   145569篇
  2021年   20019篇
  2019年   20666篇
  2018年   29329篇
  2017年   22627篇
  2016年   26269篇
  2015年   29553篇
  2014年   40502篇
  2013年   60495篇
  2012年   80340篇
  2011年   84606篇
  2010年   51068篇
  2009年   49200篇
  2008年   79142篇
  2007年   83952篇
  2006年   85683篇
  2005年   81835篇
  2004年   78826篇
  2003年   76163篇
  2002年   73435篇
  2001年   128461篇
  2000年   131396篇
  1999年   110569篇
  1998年   31286篇
  1997年   27941篇
  1996年   28236篇
  1995年   27394篇
  1994年   25084篇
  1993年   23436篇
  1992年   85202篇
  1991年   81615篇
  1990年   78824篇
  1989年   76096篇
  1988年   69512篇
  1987年   68021篇
  1986年   63567篇
  1985年   60532篇
  1984年   44970篇
  1983年   37962篇
  1982年   22476篇
  1981年   20002篇
  1979年   38976篇
  1978年   27448篇
  1977年   23273篇
  1976年   21506篇
  1975年   22827篇
  1974年   26799篇
  1973年   25393篇
  1972年   23776篇
  1971年   21962篇
  1970年   20197篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
73.
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   
74.
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   
75.
76.
77.
78.
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   
79.
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   
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