全文获取类型
收费全文 | 66964篇 |
免费 | 4065篇 |
国内免费 | 697篇 |
专业分类
耳鼻咽喉 | 1208篇 |
儿科学 | 814篇 |
妇产科学 | 976篇 |
基础医学 | 11554篇 |
口腔科学 | 1495篇 |
临床医学 | 5795篇 |
内科学 | 12497篇 |
皮肤病学 | 2330篇 |
神经病学 | 4787篇 |
特种医学 | 3784篇 |
外科学 | 8783篇 |
综合类 | 267篇 |
现状与发展 | 1篇 |
一般理论 | 17篇 |
预防医学 | 3146篇 |
眼科学 | 1634篇 |
药学 | 6256篇 |
中国医学 | 783篇 |
肿瘤学 | 5599篇 |
出版年
2023年 | 492篇 |
2022年 | 1581篇 |
2021年 | 2413篇 |
2020年 | 1184篇 |
2019年 | 1570篇 |
2018年 | 1999篇 |
2017年 | 1528篇 |
2016年 | 2217篇 |
2015年 | 3199篇 |
2014年 | 3750篇 |
2013年 | 4249篇 |
2012年 | 6452篇 |
2011年 | 5820篇 |
2010年 | 3510篇 |
2009年 | 2957篇 |
2008年 | 4137篇 |
2007年 | 3739篇 |
2006年 | 3227篇 |
2005年 | 2871篇 |
2004年 | 2465篇 |
2003年 | 2043篇 |
2002年 | 1758篇 |
2001年 | 1441篇 |
2000年 | 1318篇 |
1999年 | 951篇 |
1998年 | 406篇 |
1997年 | 293篇 |
1996年 | 238篇 |
1995年 | 199篇 |
1994年 | 166篇 |
1993年 | 154篇 |
1992年 | 345篇 |
1991年 | 335篇 |
1990年 | 290篇 |
1989年 | 273篇 |
1988年 | 257篇 |
1987年 | 258篇 |
1986年 | 188篇 |
1985年 | 174篇 |
1984年 | 126篇 |
1983年 | 115篇 |
1982年 | 58篇 |
1981年 | 63篇 |
1979年 | 85篇 |
1978年 | 71篇 |
1975年 | 51篇 |
1974年 | 61篇 |
1973年 | 52篇 |
1972年 | 51篇 |
1970年 | 49篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
Jin Ho Hong Ha Young Lee Myung Kwan Lim Mi Young Kim Young Hye Kang Kyung Hee Lee Soon Gu Cho 《Korean journal of radiology》2013,14(6):960-962
Cri-du-Chat syndrome, also called the 5p-syndrome, is a rare genetic abnormality, and only few cases have been reported on its brain MRI findings. We describe the magnetic resonance imaging findings of a 1-year-old girl with Cri-du-Chat syndrome who showed brain stem hypoplasia, particularly in the pons, with normal cerebellum and diffuse hypoplasia of the cerebral hemispheres. We suggest that Cri-du-Chat syndrome chould be suspected in children with brain stem hypoplasia, particularly for those with high-pitched cries. 相似文献
996.
New development in the vascular network is a significant process for the proliferation, as well as metastatic expand, of cancer cells that depends on a sufficient provider of oxygen and nutrients and the removal of waste products. New blood and lymphatic vessels form via step called angiogenesis and lymphangiogenesis. Angiogenesis is controlled by activator and inhibitor of some molecules. So many different proteins have been established as angiogenic activators and inhibitors. Grades of expression of angiogenic factors demonstrate the forcefulness of tumor cells. The advance of angiogenic inhibitors should help to decrease both mortality and morbidity from carcinomas. So many patients have received anti-angiogenic therapy to date. Nevertheless, their notional efficacy and anti-angiogeic treatments have not demonstrated to be useful in terms of long-term survival. There is a crucial need for a new close treatment plan combining anti-angiogenic agents with standard cyto-reductive treatments in the regulation of cancer. 相似文献
997.
Doo Kyoung Kang Yongsik Jung Sehwan Han Ji Young Kim Tae Hee Kim 《Ultrasound in medicine & biology》2017,43(2):412-420
This study evaluated the usefulness of magnetic resonance (MR)-navigated ultrasound (US) for evaluation of magnetic resonance imaging (MRI)-detected lesions not visible on second-look US and analyzed differences in lesion-to-nipple distance between supine and prone positions. Of the 831 consecutive patients who were diagnosed with breast cancer and examined with breast MRI from June 2013 to September 2015, 40 lesions in 37 patients who underwent MR-navigated US for MRI-detected lesions that were not visible on second-look US were included. First, MRI was performed in a prone position using a 1.5-T imager, and second, MRI was performed in a supine position for MR-navigated US. Of 40 lesions, 31 (78%) were identified with MR-navigated US, whereas 5 (13%) lesions disappeared on supine MRI and 4 (10%) exhibited no correlation on MR-navigated US. Of 31 lesions with pathologic confirmation, 7 (23%) were malignant, 2 (6%) were high-risk lesions and 22 (71%) were benign lesions. Comparison of the US findings of benign and malignant lesions revealed that orientation of the lesion differed significantly (p = 0.045), whereas lesion shape, margin and echo pattern did not significantly differ between the two groups (p = 0.088, p = 0.094 and p = 0.412, respectively). Median difference in lesion-to-nipple distance on supine and prone MRI was 8 mm (0–34 mm) in the horizontal direction and 5 mm (0–39.5 mm) in the vertical direction. Thirteen lesions exhibited a >1-cm difference in both horizontal and vertical directions. In conclusion, MR-navigated US was useful for the evaluation of MRI-detected lesions that were not visible on second-look US in breast cancer patients. 相似文献
998.
999.
Association of low baseline free thyroxin levels with progression of coronary artery calcification over 4 years in euthyroid subjects: the Kangbuk Samsung Health Study 下载免费PDF全文
1000.