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   3616095篇
  免费   262101篇
  国内免费   9463篇
耳鼻咽喉   48915篇
儿科学   120085篇
妇产科学   99510篇
基础医学   508810篇
口腔科学   102204篇
临床医学   331792篇
内科学   706301篇
皮肤病学   85399篇
神经病学   293199篇
特种医学   137365篇
外国民族医学   941篇
外科学   540769篇
综合类   77893篇
现状与发展   8篇
一般理论   1456篇
预防医学   277269篇
眼科学   83897篇
药学   264230篇
  13篇
中国医学   7989篇
肿瘤学   199614篇
  2019年   28719篇
  2018年   40918篇
  2017年   31192篇
  2016年   35481篇
  2015年   40193篇
  2014年   55635篇
  2013年   83162篇
  2012年   112096篇
  2011年   118664篇
  2010年   71059篇
  2009年   67441篇
  2008年   110535篇
  2007年   117658篇
  2006年   119276篇
  2005年   114428篇
  2004年   110085篇
  2003年   105883篇
  2002年   102268篇
  2001年   175865篇
  2000年   179988篇
  1999年   151380篇
  1998年   43036篇
  1997年   37924篇
  1996年   38044篇
  1995年   36892篇
  1994年   33729篇
  1993年   31606篇
  1992年   117176篇
  1991年   113027篇
  1990年   109391篇
  1989年   105685篇
  1988年   96639篇
  1987年   94675篇
  1986年   88886篇
  1985年   84868篇
  1984年   63273篇
  1983年   53709篇
  1982年   31523篇
  1981年   28081篇
  1979年   55975篇
  1978年   39299篇
  1977年   33445篇
  1976年   31181篇
  1975年   32999篇
  1974年   39354篇
  1973年   37630篇
  1972年   35134篇
  1971年   32608篇
  1970年   30137篇
  1969年   28789篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
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   
102.
103.
104.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  相似文献   
105.
106.
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   
107.
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   
108.
109.
110.
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