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   4063435篇
  免费   307702篇
  国内免费   10192篇
耳鼻咽喉   57463篇
儿科学   130324篇
妇产科学   111126篇
基础医学   568346篇
口腔科学   116914篇
临床医学   374853篇
内科学   788333篇
皮肤病学   91227篇
神经病学   337868篇
特种医学   158525篇
外国民族医学   1438篇
外科学   609909篇
综合类   91140篇
现状与发展   6篇
一般理论   1720篇
预防医学   324842篇
眼科学   94623篇
药学   301192篇
  11篇
中国医学   7981篇
肿瘤学   213488篇
  2018年   43652篇
  2017年   33582篇
  2016年   38155篇
  2015年   43067篇
  2014年   60639篇
  2013年   92061篇
  2012年   122346篇
  2011年   129831篇
  2010年   77851篇
  2009年   74431篇
  2008年   121845篇
  2007年   129422篇
  2006年   131175篇
  2005年   126816篇
  2004年   122210篇
  2003年   117829篇
  2002年   114673篇
  2001年   187051篇
  2000年   192539篇
  1999年   163296篇
  1998年   48489篇
  1997年   43271篇
  1996年   42911篇
  1995年   41615篇
  1994年   38640篇
  1993年   36153篇
  1992年   129763篇
  1991年   125528篇
  1990年   121337篇
  1989年   117246篇
  1988年   108366篇
  1987年   106747篇
  1986年   100819篇
  1985年   96584篇
  1984年   72640篇
  1983年   62032篇
  1982年   37359篇
  1981年   33616篇
  1979年   66755篇
  1978年   47237篇
  1977年   40024篇
  1976年   37495篇
  1975年   39596篇
  1974年   47990篇
  1973年   45815篇
  1972年   43110篇
  1971年   39923篇
  1970年   37310篇
  1969年   35276篇
  1968年   32454篇
排序方式: 共有10000条查询结果,搜索用时 640 毫秒
101.
102.
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   
103.
104.
105.
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   
106.
107.
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   
108.
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   
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