全文获取类型
收费全文 | 1695篇 |
免费 | 228篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 22篇 |
儿科学 | 66篇 |
妇产科学 | 23篇 |
基础医学 | 145篇 |
口腔科学 | 62篇 |
临床医学 | 265篇 |
内科学 | 389篇 |
皮肤病学 | 108篇 |
神经病学 | 47篇 |
特种医学 | 154篇 |
外科学 | 278篇 |
综合类 | 102篇 |
现状与发展 | 30篇 |
预防医学 | 75篇 |
眼科学 | 15篇 |
药学 | 43篇 |
中国医学 | 3篇 |
肿瘤学 | 114篇 |
出版年
2024年 | 14篇 |
2023年 | 179篇 |
2022年 | 14篇 |
2021年 | 22篇 |
2020年 | 61篇 |
2019年 | 24篇 |
2018年 | 52篇 |
2017年 | 46篇 |
2016年 | 46篇 |
2015年 | 58篇 |
2014年 | 95篇 |
2013年 | 74篇 |
2012年 | 50篇 |
2011年 | 54篇 |
2010年 | 89篇 |
2009年 | 93篇 |
2008年 | 51篇 |
2007年 | 66篇 |
2006年 | 46篇 |
2005年 | 39篇 |
2004年 | 25篇 |
2003年 | 30篇 |
2002年 | 32篇 |
2001年 | 34篇 |
2000年 | 42篇 |
1999年 | 34篇 |
1998年 | 37篇 |
1997年 | 53篇 |
1996年 | 43篇 |
1995年 | 39篇 |
1994年 | 31篇 |
1993年 | 41篇 |
1992年 | 16篇 |
1991年 | 22篇 |
1990年 | 19篇 |
1989年 | 36篇 |
1988年 | 32篇 |
1987年 | 22篇 |
1986年 | 11篇 |
1985年 | 17篇 |
1984年 | 14篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 8篇 |
1978年 | 12篇 |
1976年 | 19篇 |
1975年 | 13篇 |
1972年 | 6篇 |
排序方式: 共有1941条查询结果,搜索用时 15 毫秒
1.
A mixed‐method study of effects of a therapeutic play intervention for children on parental anxiety and parents' perceptions of the intervention
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence. 相似文献
3.
4.
Bibhuti B Das Linda B Pauliks Ole A Knudson Scott Kirby Kak-Chen Chan Lilliam Valdes-Cruz Raul O Cayre 《Journal of the American Society of Echocardiography》2005,18(3):231-236
We identified 18 patients with double-orifice mitral valve (DOMV) and intact atrioventricular (AV) septum out of 40,179 echocardiographic studies performed between 1997 and 2002 at Children's Hospital, Denver, CO. In this study we describe (1) the anatomic characteristics of the DOMV in the absence of AV septal defect, (2) the function of the mitral valve by spectral and color Doppler flow mapping, and (3) associated lesions. The topographic location of the orifices in the leaflets suggests possible embryologic mechanisms of DOMV. In this series, DOMV was most commonly associated with left-sided obstructive lesions (in 39% of patients). Spectral and color Doppler interrogation demonstrated a normal flow profile in most cases; only 2 patients had significant mitral regurgitation or stenosis. Therefore, due to the uncertain natural history of this lesion and the potential need for endocarditis prophylaxis, careful imaging of the mitral valve is recommended, particularly in the presence of left-sided obstructive lesions. 相似文献
5.
6.
7.
8.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
9.
10.
Roderik Metz Gino MMJ Kerkhoffs Egbert-Jan MM Verleisdonk Geert J van der Heijden 《BMC musculoskeletal disorders》2007,8(1):108