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   3557871篇
  免费   307310篇
  国内免费   14197篇
耳鼻咽喉   48351篇
儿科学   113713篇
妇产科学   93000篇
基础医学   566679篇
口腔科学   94258篇
临床医学   321309篇
内科学   636151篇
皮肤病学   93765篇
神经病学   307594篇
特种医学   139332篇
外国民族医学   490篇
外科学   547449篇
综合类   108146篇
现状与发展   24篇
一般理论   2396篇
预防医学   298216篇
眼科学   81657篇
药学   244735篇
  19篇
中国医学   10533篇
肿瘤学   171561篇
  2021年   55637篇
  2020年   35457篇
  2019年   58608篇
  2018年   72391篇
  2017年   55011篇
  2016年   60803篇
  2015年   74557篇
  2014年   108994篇
  2013年   174300篇
  2012年   103347篇
  2011年   104377篇
  2010年   119320篇
  2009年   123337篇
  2008年   90227篇
  2007年   94251篇
  2006年   104253篇
  2005年   99477篇
  2004年   100536篇
  2003年   90765篇
  2002年   79938篇
  2001年   118340篇
  2000年   111718篇
  1999年   107697篇
  1998年   66832篇
  1997年   64358篇
  1996年   62187篇
  1995年   57613篇
  1994年   51565篇
  1993年   48131篇
  1992年   74285篇
  1991年   69935篇
  1990年   65660篇
  1989年   64453篇
  1988年   59427篇
  1987年   58130篇
  1986年   54663篇
  1985年   54463篇
  1984年   49528篇
  1983年   45097篇
  1982年   42224篇
  1981年   39613篇
  1980年   37263篇
  1979年   40250篇
  1978年   35598篇
  1977年   32306篇
  1976年   29629篇
  1975年   27951篇
  1974年   29016篇
  1973年   28039篇
  1972年   26244篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
201.
202.
203.
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   
204.
205.
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   
206.
207.
208.
209.
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   
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