全文获取类型
收费全文 | 532篇 |
免费 | 29篇 |
国内免费 | 13篇 |
专业分类
儿科学 | 30篇 |
妇产科学 | 5篇 |
基础医学 | 22篇 |
口腔科学 | 19篇 |
临床医学 | 60篇 |
内科学 | 90篇 |
皮肤病学 | 14篇 |
神经病学 | 12篇 |
特种医学 | 181篇 |
外科学 | 21篇 |
综合类 | 46篇 |
预防医学 | 13篇 |
眼科学 | 5篇 |
药学 | 32篇 |
1篇 | |
肿瘤学 | 23篇 |
出版年
2021年 | 4篇 |
2018年 | 5篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 9篇 |
2011年 | 10篇 |
2010年 | 10篇 |
2009年 | 13篇 |
2007年 | 13篇 |
2006年 | 11篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 10篇 |
2002年 | 3篇 |
2001年 | 6篇 |
1999年 | 5篇 |
1998年 | 24篇 |
1997年 | 24篇 |
1996年 | 20篇 |
1995年 | 27篇 |
1994年 | 22篇 |
1993年 | 35篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 10篇 |
1989年 | 19篇 |
1988年 | 22篇 |
1987年 | 42篇 |
1986年 | 27篇 |
1985年 | 24篇 |
1984年 | 12篇 |
1983年 | 12篇 |
1982年 | 6篇 |
1981年 | 14篇 |
1980年 | 12篇 |
1978年 | 9篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 5篇 |
1963年 | 2篇 |
1959年 | 7篇 |
1958年 | 7篇 |
1957年 | 10篇 |
1956年 | 6篇 |
1955年 | 5篇 |
1949年 | 2篇 |
1948年 | 4篇 |
排序方式: 共有574条查询结果,搜索用时 31 毫秒
91.
H.J. DODD J.D.T. KIRBY T.J. CHAMBERS† A.G. STANSFELD† 《Clinical and experimental dermatology》1984,9(6):608-613
An association of erythema annulare centrifugum with malignant histiocytosis is reported. The erythema annulare centrifugum preceded the malignant histiocytosis by 20 months but careful review of the patient led to early diagnosis of the malignancy. Monoclonal antibody studies helped to confirm the nature of the tumour. 相似文献
92.
93.
94.
Hepatocellular carcinoma: assessment of resectability by computed tomography and ultrasound 总被引:2,自引:0,他引:2
A retrospective review of the CT and ultrasound scans from examinations of 30 patients who had hepatocellular carcinoma (hepatoma) was undertaken with special emphasis placed on evaluation of hepatic distribution of tumor, vascular invasion, and extrahepatic spread. Although both CT and ultrasound detected hepatoma in 29 of 30 patients (96%), CT showed more extensive hepatic parenchymal involvement in eight of the patients. Vascular invasion was seen more frequently with ultrasound than with CT. Invasion into the main portal vein was seen by ultrasound in 11 of 30 patients (37%). Extrahepatic spread of tumor was much more frequently detected by CT and was present in 21 of 30 patients (70%). A reasoned approach to the diagnostic workup of hepatomas that will minimize invasive procedures and unnecessary surgery is presented. 相似文献
95.
96.
97.
Rosen BR; Fleming DM; Kushner DC; Zaner KS; Buxton RB; Bennet WP; Wismer GL; Brady TJ 《Radiology》1988,169(3):799
98.
99.
Left ventricular volumes measured by MR imaging 总被引:9,自引:0,他引:9
We assessed the potential of proton magnetic resonance (MR) imaging for accurately measuring left ventricular volumes using 15 latex casts of excised human left ventricles. The casts were submerged in water to stimulate the endocardial left ventricular cavity interface in in vivo imaging conditions. Tomographic image sections perpendicular to the long axis of the cast were obtained, spanning each cast from apex to base. Simpson's rule was used to calculate the cast volumes. Correlation between the actual cast volumes (as measured by the displacement method) and the calculated volumes using MR imaging for the 15 casts was excellent. Our data demonstrate that MR imaging accurately measures cardiac chamber volumes in this in vitro model. 相似文献
100.