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   3228356篇
  免费   280008篇
  国内免费   13707篇
耳鼻咽喉   44259篇
儿科学   103827篇
妇产科学   82895篇
基础医学   521711篇
口腔科学   86960篇
临床医学   291475篇
内科学   564333篇
皮肤病学   88327篇
神经病学   278945篇
特种医学   127348篇
外国民族医学   329篇
外科学   501166篇
综合类   100645篇
现状与发展   23篇
一般理论   2263篇
预防医学   274341篇
眼科学   73847篇
药学   220315篇
  23篇
中国医学   9313篇
肿瘤学   149726篇
  2021年   54807篇
  2020年   35000篇
  2019年   57927篇
  2018年   70741篇
  2017年   53985篇
  2016年   59560篇
  2015年   73703篇
  2014年   107867篇
  2013年   173109篇
  2012年   86651篇
  2011年   86170篇
  2010年   115266篇
  2009年   119984篇
  2008年   73252篇
  2007年   75399篇
  2006年   86563篇
  2005年   81850篇
  2004年   84183篇
  2003年   75205篇
  2002年   64966篇
  2001年   94401篇
  2000年   86932篇
  1999年   88643篇
  1998年   64297篇
  1997年   62351篇
  1996年   60117篇
  1995年   55663篇
  1994年   49934篇
  1993年   46502篇
  1992年   62337篇
  1991年   59450篇
  1990年   56554篇
  1989年   55930篇
  1988年   51592篇
  1987年   51006篇
  1986年   48115篇
  1985年   48632篇
  1984年   45265篇
  1983年   41545篇
  1982年   40681篇
  1981年   38490篇
  1980年   36195篇
  1979年   37047篇
  1978年   33745篇
  1977年   30953篇
  1976年   28454篇
  1975年   26798篇
  1974年   27568篇
  1973年   26525篇
  1972年   24637篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
201.
202.
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   
203.
204.
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   
205.
206.
207.
208.
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   
209.
210.
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