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   2584095篇
  免费   189308篇
  国内免费   7564篇
耳鼻咽喉   34292篇
儿科学   85220篇
妇产科学   71589篇
基础医学   363702篇
口腔科学   69682篇
临床医学   234581篇
内科学   515750篇
皮肤病学   62465篇
神经病学   213483篇
特种医学   99920篇
外国民族医学   736篇
外科学   386626篇
综合类   50413篇
现状与发展   5篇
一般理论   968篇
预防医学   196209篇
眼科学   56683篇
药学   188032篇
  8篇
中国医学   5332篇
肿瘤学   145271篇
  2021年   20008篇
  2019年   20650篇
  2018年   29314篇
  2017年   22615篇
  2016年   26244篇
  2015年   29531篇
  2014年   40477篇
  2013年   60461篇
  2012年   80281篇
  2011年   84551篇
  2010年   51036篇
  2009年   49189篇
  2008年   79063篇
  2007年   83890篇
  2006年   85610篇
  2005年   81768篇
  2004年   78772篇
  2003年   76085篇
  2002年   73371篇
  2001年   128423篇
  2000年   131348篇
  1999年   110521篇
  1998年   31269篇
  1997年   27928篇
  1996年   28225篇
  1995年   27387篇
  1994年   25075篇
  1993年   23428篇
  1992年   85168篇
  1991年   81569篇
  1990年   78788篇
  1989年   76070篇
  1988年   69480篇
  1987年   68002篇
  1986年   63544篇
  1985年   60515篇
  1984年   44950篇
  1983年   37945篇
  1982年   22459篇
  1981年   19988篇
  1979年   38963篇
  1978年   27448篇
  1977年   23256篇
  1976年   21499篇
  1975年   22822篇
  1974年   26789篇
  1973年   25380篇
  1972年   23753篇
  1971年   21959篇
  1970年   20188篇
排序方式: 共有10000条查询结果,搜索用时 15 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