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   3536347篇
  免费   306405篇
  国内免费   14400篇
耳鼻咽喉   48152篇
儿科学   113077篇
妇产科学   92907篇
基础医学   563733篇
口腔科学   94077篇
临床医学   318872篇
内科学   631912篇
皮肤病学   93894篇
神经病学   304911篇
特种医学   138574篇
外国民族医学   490篇
外科学   543806篇
综合类   108411篇
现状与发展   24篇
一般理论   2359篇
预防医学   296016篇
眼科学   81403篇
药学   243355篇
  19篇
中国医学   10729篇
肿瘤学   170431篇
  2021年   55634篇
  2020年   35480篇
  2019年   58521篇
  2018年   72158篇
  2017年   54793篇
  2016年   60635篇
  2015年   74589篇
  2014年   108989篇
  2013年   174153篇
  2012年   100758篇
  2011年   101324篇
  2010年   118715篇
  2009年   122935篇
  2008年   87688篇
  2007年   91451篇
  2006年   101816篇
  2005年   97030篇
  2004年   98285篇
  2003年   88595篇
  2002年   78010篇
  2001年   118628篇
  2000年   112077篇
  1999年   107943篇
  1998年   66771篇
  1997年   64322篇
  1996年   62154篇
  1995年   57587篇
  1994年   51524篇
  1993年   48085篇
  1992年   74399篇
  1991年   70084篇
  1990年   65806篇
  1989年   64600篇
  1988年   59526篇
  1987年   58258篇
  1986年   54777篇
  1985年   54539篇
  1984年   49582篇
  1983年   45123篇
  1982年   42204篇
  1981年   39582篇
  1980年   37265篇
  1979年   40314篇
  1978年   35615篇
  1977年   32310篇
  1976年   29653篇
  1975年   27983篇
  1974年   29051篇
  1973年   28057篇
  1972年   26266篇
排序方式: 共有10000条查询结果,搜索用时 625 毫秒
201.
202.
203.
204.
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   
205.
206.
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   
207.
208.
209.
210.
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   
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