全文获取类型
收费全文 | 3939篇 |
免费 | 397篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 134篇 |
妇产科学 | 196篇 |
基础医学 | 477篇 |
口腔科学 | 143篇 |
临床医学 | 390篇 |
内科学 | 751篇 |
皮肤病学 | 52篇 |
神经病学 | 327篇 |
特种医学 | 218篇 |
外科学 | 526篇 |
综合类 | 157篇 |
一般理论 | 12篇 |
预防医学 | 362篇 |
眼科学 | 47篇 |
药学 | 334篇 |
中国医学 | 1篇 |
肿瘤学 | 204篇 |
出版年
2021年 | 56篇 |
2020年 | 43篇 |
2019年 | 54篇 |
2018年 | 71篇 |
2017年 | 51篇 |
2016年 | 50篇 |
2015年 | 62篇 |
2014年 | 104篇 |
2013年 | 146篇 |
2012年 | 167篇 |
2011年 | 176篇 |
2010年 | 120篇 |
2009年 | 107篇 |
2008年 | 152篇 |
2007年 | 164篇 |
2006年 | 162篇 |
2005年 | 178篇 |
2004年 | 138篇 |
2003年 | 136篇 |
2002年 | 117篇 |
2001年 | 128篇 |
2000年 | 113篇 |
1999年 | 130篇 |
1998年 | 74篇 |
1997年 | 73篇 |
1996年 | 92篇 |
1995年 | 71篇 |
1994年 | 59篇 |
1993年 | 67篇 |
1992年 | 88篇 |
1991年 | 61篇 |
1990年 | 76篇 |
1989年 | 61篇 |
1988年 | 85篇 |
1987年 | 84篇 |
1986年 | 90篇 |
1985年 | 60篇 |
1984年 | 56篇 |
1983年 | 56篇 |
1982年 | 45篇 |
1981年 | 23篇 |
1979年 | 41篇 |
1978年 | 33篇 |
1977年 | 37篇 |
1976年 | 37篇 |
1975年 | 29篇 |
1973年 | 23篇 |
1972年 | 23篇 |
1969年 | 22篇 |
1967年 | 27篇 |
排序方式: 共有4345条查询结果,搜索用时 15 毫秒
1.
D Gröne† R Treudler† EM de Villiers‡ R Husak† CE Orfanos† ChC Zouboulis†§ 《Journal of the European Academy of Dermatology and Venereology》2006,20(2):202-205
Cidofovir is an acyclic nucleoside phosphonate with broad-spectrum activity against DNA viruses, including human papilloma virus (HPV). However, data on the efficacy of cidofovir in an immunosuppressive setting remain contradictory. We report for the first time on the promotion of the healing of recalcitrant warts in a patient with myelodysplastic syndrome with intravenous cidofovir treatment. 相似文献
2.
3.
C M Mond D B Walters R S Stricoff E M Prescott A T Prokopetz 《American Industrial Hygiene Association journal》1987,48(10):823-829
A human factors engineering analysis of a chemical containment laboratory was performed to develop appropriate standards for future laboratory design. In order to perform this evaluation, a state-of-the-art facility was studied in depth. Measurements and observations were made of key operating areas. In addition, technicians were observed and interviewed as they performed various tasks. Compiled data were compared to existing ergonomic standards. The occupational implications of instituting ergonomically developed laboratory design standards are as follows: increased worker health, safety and productivity, improved work quality and reduced stress. 相似文献
4.
5.
6.
7.
8.
Four separate experiments were carried out by dosing dogs (Beagles and Border collies) and red foxes with protoscoleces obtained from hydatid cysts in sheep from mid-Wales. The dogs and foxes were killed at intervals over a period from 34-180 days after infection and the intestines were examined for Echinococcus granulosus. Border collie dogs were efficient hosts in that large numbers of worms developed, with gravid segments present by 55 days after infection; but Beagle dogs were poor hosts in that only small numbers of immature worms developed. Foxes were poor hosts in that few or no worms developed, but gravid segments were seen in three of 29 foxes. The worms showed morphological features similar to the 'sheep' rather than the 'horse' strain. 相似文献
9.
Digital radiography of subtle pulmonary abnormalities: an ROC study of the effect of pixel size on observer performance 总被引:3,自引:0,他引:3
Forty conventional radiographs with examples of mild interstitial infiltrates and subtle pneumothoraces and 40 normal studies of the chest were selected and digitized, with pixel sizes of 1.0, 0.5, 0.2, and 0.1 mm. Observer performance tests were carried out using receiver operating characteristic analysis. Conventional radiographs and digitized images were compared. The results indicate that, in such cases, diagnostic accuracy increases significantly as the pixel size is reduced, at least to the 0.1-mm level. We conclude that, for digital systems using screen-film or similar image receptors, use of a pixel size substantially larger than 0.1 mm may result in some loss of diagnostic accuracy. 相似文献