全文获取类型
收费全文 | 1446774篇 |
免费 | 110343篇 |
国内免费 | 2234篇 |
专业分类
耳鼻咽喉 | 18450篇 |
儿科学 | 45841篇 |
妇产科学 | 38801篇 |
基础医学 | 212936篇 |
口腔科学 | 38774篇 |
临床医学 | 135749篇 |
内科学 | 285855篇 |
皮肤病学 | 29784篇 |
神经病学 | 120276篇 |
特种医学 | 52884篇 |
外国民族医学 | 278篇 |
外科学 | 207356篇 |
综合类 | 28931篇 |
现状与发展 | 5篇 |
一般理论 | 852篇 |
预防医学 | 121907篇 |
眼科学 | 31996篇 |
药学 | 105466篇 |
7篇 | |
中国医学 | 2358篇 |
肿瘤学 | 80845篇 |
出版年
2021年 | 12349篇 |
2019年 | 12882篇 |
2018年 | 17024篇 |
2017年 | 13199篇 |
2016年 | 14291篇 |
2015年 | 16545篇 |
2014年 | 23207篇 |
2013年 | 35347篇 |
2012年 | 48861篇 |
2011年 | 52373篇 |
2010年 | 30161篇 |
2009年 | 28603篇 |
2008年 | 49476篇 |
2007年 | 52914篇 |
2006年 | 52135篇 |
2005年 | 51640篇 |
2004年 | 49669篇 |
2003年 | 47280篇 |
2002年 | 45739篇 |
2001年 | 57810篇 |
2000年 | 58464篇 |
1999年 | 49988篇 |
1998年 | 15879篇 |
1997年 | 14414篇 |
1996年 | 14650篇 |
1995年 | 13692篇 |
1994年 | 12695篇 |
1993年 | 11893篇 |
1992年 | 39399篇 |
1991年 | 38816篇 |
1990年 | 37467篇 |
1989年 | 36198篇 |
1988年 | 33670篇 |
1987年 | 33033篇 |
1986年 | 31492篇 |
1985年 | 29841篇 |
1984年 | 23370篇 |
1983年 | 20559篇 |
1982年 | 13029篇 |
1979年 | 21733篇 |
1978年 | 16315篇 |
1977年 | 13670篇 |
1976年 | 12646篇 |
1975年 | 13495篇 |
1974年 | 16249篇 |
1973年 | 15930篇 |
1972年 | 14931篇 |
1971年 | 13885篇 |
1970年 | 13120篇 |
1969年 | 12310篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
Wojciech Szychta M.D. Ph.D. Gheorghe Cerin M.D. Ph.D. F.E.S.C. Bogdan Adrian Popa M.D. Armienti Felice M.D. Guido Lanzillo M.D. Ph.D. Marco Diena M.D. Grzegorz Opolski M.D. Ph.D. F.E.S.C. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(6):1040-1043
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
45.
46.
47.
John Bickle 《Topics in Cognitive Science》2015,7(2):299-311
David Marr's three-level method for completely understanding a cognitive system and the importance he attaches to the computational level are so familiar as to scarcely need repeating. Fewer seem to recognize that Marr defends his famous method by criticizing the “reductionistic approach.” This sets up a more interesting relationship between Marr and reductionism than is usually acknowledged. I argue that Marr was correct in his criticism of the reductionists of his time—they were only describing (cellular activity), not explaining (cognitive functions). But a careful metascientific account of reductionistic neuroscience over the past two decades reveals that Marr's criticisms no longer have force. Contemporary neuroscience now explains cognition directly, although in a fashion—causal-mechanistically—quite different than Marr recommended. So while Marr was correct to reject the reductionism of his day and offer an alternative method for genuinely explaining cognition, contemporary cognitive scientists now owe us a new defense of Marr's famous method and the advantages of its explanations over the type now pursued successfully in current reductionist neuroscience. There are familiar reasons for thinking that this debt will not be paid easily. 相似文献
48.
Improvement in Tricuspid Annular Plane Systolic Excursion with Pulmonary Hypertension Therapy in Pediatric Patients
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
49.
50.