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   3607338篇
  免费   261735篇
  国内免费   9451篇
耳鼻咽喉   48803篇
儿科学   119884篇
妇产科学   99363篇
基础医学   508023篇
口腔科学   102075篇
临床医学   330675篇
内科学   703786篇
皮肤病学   85341篇
神经病学   292492篇
特种医学   137136篇
外国民族医学   941篇
外科学   539957篇
综合类   77710篇
现状与发展   8篇
一般理论   1392篇
预防医学   276370篇
眼科学   83692篇
药学   263861篇
  12篇
中国医学   7987篇
肿瘤学   199016篇
  2019年   28656篇
  2018年   40845篇
  2017年   31132篇
  2016年   35426篇
  2015年   40139篇
  2014年   55553篇
  2013年   83019篇
  2012年   111903篇
  2011年   118451篇
  2010年   70930篇
  2009年   67335篇
  2008年   110300篇
  2007年   117415篇
  2006年   119035篇
  2005年   114184篇
  2004年   109873篇
  2003年   105669篇
  2002年   102066篇
  2001年   175746篇
  2000年   179885篇
  1999年   151285篇
  1998年   42992篇
  1997年   37867篇
  1996年   37994篇
  1995年   36843篇
  1994年   33680篇
  1993年   31561篇
  1992年   117091篇
  1991年   112934篇
  1990年   109312篇
  1989年   105606篇
  1988年   96567篇
  1987年   94588篇
  1986年   88804篇
  1985年   84782篇
  1984年   63208篇
  1983年   53638篇
  1982年   31460篇
  1981年   28041篇
  1979年   55913篇
  1978年   39253篇
  1977年   33404篇
  1976年   31146篇
  1975年   32962篇
  1974年   39316篇
  1973年   37583篇
  1972年   35097篇
  1971年   32576篇
  1970年   30081篇
  1969年   28732篇
排序方式: 共有10000条查询结果,搜索用时 15 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