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   1712168篇
  免费   127877篇
  国内免费   3825篇
耳鼻咽喉   21943篇
儿科学   56128篇
妇产科学   46566篇
基础医学   244251篇
口腔科学   49256篇
临床医学   152984篇
内科学   336393篇
皮肤病学   39080篇
神经病学   133681篇
特种医学   64824篇
外国民族医学   297篇
外科学   260125篇
综合类   39189篇
现状与发展   4篇
一般理论   541篇
预防医学   125497篇
眼科学   40775篇
药学   125203篇
  7篇
中国医学   4501篇
肿瘤学   102625篇
  2021年   13073篇
  2019年   13849篇
  2018年   20313篇
  2017年   15518篇
  2016年   16938篇
  2015年   19414篇
  2014年   26828篇
  2013年   38838篇
  2012年   54068篇
  2011年   56810篇
  2010年   33545篇
  2009年   31417篇
  2008年   52858篇
  2007年   56219篇
  2006年   56618篇
  2005年   53919篇
  2004年   52105篇
  2003年   49418篇
  2002年   47610篇
  2001年   92095篇
  2000年   93865篇
  1999年   77224篇
  1998年   19984篇
  1997年   17536篇
  1996年   17626篇
  1995年   16955篇
  1994年   15468篇
  1993年   14244篇
  1992年   57471篇
  1991年   55417篇
  1990年   53085篇
  1989年   50877篇
  1988年   46262篇
  1987年   45069篇
  1986年   42325篇
  1985年   40123篇
  1984年   29499篇
  1983年   25009篇
  1982年   14048篇
  1979年   25606篇
  1978年   17654篇
  1977年   14939篇
  1976年   13956篇
  1975年   14622篇
  1974年   17734篇
  1973年   17005篇
  1972年   15755篇
  1971年   14516篇
  1970年   13468篇
  1969年   12563篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
51.
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   
52.
The Combined Aerobic and Resistance Exercise (CARE) Trial compared different types and doses of exercise performed during breast cancer chemotherapy. Here, we report the longer-term follow-up of patient-reported outcomes, health-related fitness and exercise behavior at 6, 12 and 24 months postintervention. A multicenter trial in Canada randomized 301 breast cancer patients initiating chemotherapy to thrice weekly, supervised exercise consisting of a standard dose of 25–30 min of aerobic exercise (STAN; n = 96), a higher dose of 50–60 min of aerobic exercise (HIGH; n = 101) or a combined dose of 50–60 min of aerobic and resistance exercise (COMB; n = 104) performed for the duration of chemotherapy (median of 17 weeks). Primary outcomes were patient-reported outcomes including quality of life, cancer-related symptoms and psychosocial outcomes. Secondary outcomes were objective health-related fitness (assessed at 12 months only) and self-reported exercise behavior. A total of 269 (89.4%) participants completed patient-reported outcomes at all three follow-up time points and 263 (87.4%) completed the health-related fitness assessment at 12-month follow-up. COMB was significantly superior to (i) STAN for sleep quality at 6-month follow-up (p = 0.027); (ii) HIGH for upper body muscular endurance at 12-month follow-up (p = 0.020); and (iii) HIGH for meeting the resistance exercise guideline at 6-month follow-up (p = 0.006). Moreover, self-reported meeting of the combined exercise guideline during follow-up was significantly associated with better patient-reported outcomes and health-related fitness. Performing combined exercise during and after breast cancer chemotherapy may result in better longer-term patient-reported outcomes and health-related fitness compared to performing aerobic exercise alone.  相似文献   
53.
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   
54.
55.
56.
57.
58.
59.
60.
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