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   4118671篇
  免费   307950篇
  国内免费   10199篇
耳鼻咽喉   57872篇
儿科学   132351篇
妇产科学   112038篇
基础医学   575059篇
口腔科学   117282篇
临床医学   378201篇
内科学   799834篇
皮肤病学   91509篇
神经病学   343406篇
特种医学   160960篇
外国民族医学   1438篇
外科学   619039篇
综合类   91569篇
现状与发展   6篇
一般理论   1720篇
预防医学   329667篇
眼科学   95291篇
药学   304227篇
  11篇
中国医学   7986篇
肿瘤学   217354篇
  2018年   49998篇
  2017年   38644篇
  2016年   44185篇
  2015年   43319篇
  2014年   60792篇
  2013年   92213篇
  2012年   124116篇
  2011年   135554篇
  2010年   82646篇
  2009年   77688篇
  2008年   127717篇
  2007年   136435篇
  2006年   131321篇
  2005年   128151篇
  2004年   123736篇
  2003年   119901篇
  2002年   116053篇
  2001年   187231篇
  2000年   192823篇
  1999年   163421篇
  1998年   48593篇
  1997年   43414篇
  1996年   42987篇
  1995年   41716篇
  1994年   38759篇
  1993年   36235篇
  1992年   129829篇
  1991年   125624篇
  1990年   121427篇
  1989年   117304篇
  1988年   108432篇
  1987年   106821篇
  1986年   100876篇
  1985年   96646篇
  1984年   72674篇
  1983年   62072篇
  1982年   37406篇
  1981年   33623篇
  1979年   66825篇
  1978年   47279篇
  1977年   40032篇
  1976年   37537篇
  1975年   39595篇
  1974年   48014篇
  1973年   45814篇
  1972年   43107篇
  1971年   39925篇
  1970年   37322篇
  1969年   35293篇
  1968年   32460篇
排序方式: 共有10000条查询结果,搜索用时 281 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