全文获取类型
收费全文 | 3913篇 |
免费 | 210篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 46篇 |
妇产科学 | 45篇 |
基础医学 | 391篇 |
口腔科学 | 76篇 |
临床医学 | 276篇 |
内科学 | 1195篇 |
皮肤病学 | 132篇 |
神经病学 | 147篇 |
特种医学 | 177篇 |
外科学 | 698篇 |
综合类 | 13篇 |
一般理论 | 1篇 |
预防医学 | 167篇 |
眼科学 | 42篇 |
药学 | 196篇 |
中国医学 | 8篇 |
肿瘤学 | 516篇 |
出版年
2023年 | 29篇 |
2022年 | 82篇 |
2021年 | 145篇 |
2020年 | 75篇 |
2019年 | 86篇 |
2018年 | 88篇 |
2017年 | 74篇 |
2016年 | 102篇 |
2015年 | 120篇 |
2014年 | 123篇 |
2013年 | 115篇 |
2012年 | 214篇 |
2011年 | 247篇 |
2010年 | 123篇 |
2009年 | 89篇 |
2008年 | 159篇 |
2007年 | 189篇 |
2006年 | 176篇 |
2005年 | 139篇 |
2004年 | 149篇 |
2003年 | 134篇 |
2002年 | 119篇 |
2001年 | 100篇 |
2000年 | 140篇 |
1999年 | 142篇 |
1998年 | 70篇 |
1997年 | 47篇 |
1996年 | 60篇 |
1995年 | 40篇 |
1994年 | 43篇 |
1993年 | 34篇 |
1992年 | 80篇 |
1991年 | 67篇 |
1990年 | 61篇 |
1989年 | 58篇 |
1988年 | 53篇 |
1987年 | 38篇 |
1986年 | 30篇 |
1985年 | 40篇 |
1984年 | 27篇 |
1983年 | 14篇 |
1982年 | 18篇 |
1979年 | 26篇 |
1977年 | 23篇 |
1975年 | 15篇 |
1973年 | 15篇 |
1972年 | 13篇 |
1971年 | 14篇 |
1969年 | 14篇 |
1967年 | 13篇 |
排序方式: 共有4160条查询结果,搜索用时 15 毫秒
71.
72.
Plexiform schwannoma (PS) is a rare variety of benign nerve sheath tumor characterized by a multinodular plexiform growth pattern. PS is usually confined to the head and neck or skin. The pre-operative diagnosis of PS is difficult, and this has lead to a common misdiagnosis as a schwannoma. In addition, studies have indicated that an incomplete resection of PS often results in tumor recurrence. Here we describe a rare case of PS presented in the parapharyngeal space. Our case involved a 36-year-old man with swelling of the pharynx, who presented with a soft cervical mass. MRI revealed a multinodular mass in the left parapharyngeal space, and further pathological diagnosis by the referral hospital indicated schwannoma. A cervical approach was taken and the tumor was removed with preservation of the nerve sheath by intracapsular resection. The tumor recurred within one year after the first surgery in the same lesion of the left parapharyngeal space. The second surgical approach was a combination of a facial dismasking flap and trans-pterygopalatine fossa. The mass was resected completely, and the diagnosis of PS was confirmed by histopathology. While schwannoma commonly occurs in the head and neck, parapharyngeal space PS is rare, and pre-operative pathological diagnosis of PS is difficult. MRI studies of PS revealed distinctive features that we found useful in pre-operative diagnosis. Intracapsular resection of PS with nerve preservation has a very high recurrence rate of the tumor. Therefore, if MRI findings suggest PS we recommend removing the tumor completely without nerve preservation will offer the most curative outcome. 相似文献
73.
74.
Diagnostic and clinical role of serum proteinase 3 antineutrophil cytoplasmic antibodies in inflammatory bowel disease
下载免费PDF全文
![点击此处可从《Journal of gastroenterology and hepatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
75.
76.
Tullio Valente Giovanni Rossi Francesco Lassandro Gaetano Rea Maurizio Muto 《Clinical anatomy (New York, N.Y.)》2013,26(8):1008-1013
Isolated herniation of the pancreas through a gastroesophageal hiatus is an extremely rare condition, and only one case has been reported in the world literature. We describe a MDCT diagnosis of isolated partial hiatal hernia containing the body of a normal pancreas in an asymptomatic patient, give an anatomical explanation and review the corresponding literature. Clin. Anat. 26:1008–1013, 2013. © 2013 Wiley Periodicals, Inc. 相似文献
77.
78.
Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia
下载免费PDF全文
![点击此处可从《European journal of oral sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Keisuke Nakamura Yusuke Katsuda Shuhei Ankyu Akio Harada Taichi Tenkumo Taro Kanno Yoshimi Niwano Hiroshi Egusa Percy Milleding Ulf Örtengren 《European journal of oral sciences》2015,123(5):375-380
Zirconia‐based dental restorations are becoming used more commonly. However, limited attention has been given to the difficulties experienced, concerning cutting, in removing the restorations when needed. The aim of the present study was to compare the cutting efficiency of diamond burs, operated using an electric high‐speed dental handpiece, on zirconia (Zir) with those on lithium disilicate glass–ceramic (LD) and leucite glass–ceramic (L). In addition, evaluation of the cutting efficiency of diamond burs on Zir of different thicknesses was performed. Specimens of Zir were prepared with thicknesses of 0.5, 1.0, 2.0, and 4.0 mm, and specimens of LD and L were prepared with a thickness of 1.0 mm. Cutting tests were performed using diamond burs with super coarse (SC) and coarse (C) grains. The handpiece was operated at 150,000 rpm with a cutting force of 0.9 N. The results demonstrated that cutting of Zir took about 1.5‐ and 7‐fold longer than cutting of LD and L, respectively. The SC grains showed significantly higher cutting efficiency on Zir than the C grains. However, when the thickness of Zir increased, the cutting depth was significantly decreased. As it is suggested that cutting of zirconia is time consuming, this should be taken into consideration in advance when working with zirconia restorations. 相似文献
79.
80.