全文获取类型
收费全文 | 6450篇 |
免费 | 1038篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 53篇 |
儿科学 | 284篇 |
妇产科学 | 142篇 |
基础医学 | 951篇 |
口腔科学 | 159篇 |
临床医学 | 951篇 |
内科学 | 1091篇 |
皮肤病学 | 74篇 |
神经病学 | 757篇 |
特种医学 | 352篇 |
外国民族医学 | 1篇 |
外科学 | 685篇 |
综合类 | 469篇 |
一般理论 | 3篇 |
预防医学 | 505篇 |
眼科学 | 127篇 |
药学 | 615篇 |
中国医学 | 3篇 |
肿瘤学 | 302篇 |
出版年
2021年 | 79篇 |
2019年 | 83篇 |
2018年 | 117篇 |
2017年 | 82篇 |
2016年 | 76篇 |
2015年 | 111篇 |
2014年 | 143篇 |
2013年 | 199篇 |
2012年 | 270篇 |
2011年 | 281篇 |
2010年 | 170篇 |
2009年 | 150篇 |
2008年 | 226篇 |
2007年 | 251篇 |
2006年 | 261篇 |
2005年 | 303篇 |
2004年 | 253篇 |
2003年 | 239篇 |
2002年 | 248篇 |
2001年 | 214篇 |
2000年 | 220篇 |
1999年 | 210篇 |
1998年 | 123篇 |
1997年 | 94篇 |
1996年 | 112篇 |
1995年 | 96篇 |
1994年 | 92篇 |
1993年 | 87篇 |
1992年 | 158篇 |
1991年 | 174篇 |
1990年 | 132篇 |
1989年 | 165篇 |
1988年 | 159篇 |
1987年 | 190篇 |
1986年 | 146篇 |
1985年 | 157篇 |
1984年 | 120篇 |
1983年 | 105篇 |
1982年 | 86篇 |
1981年 | 94篇 |
1980年 | 106篇 |
1979年 | 106篇 |
1978年 | 70篇 |
1977年 | 72篇 |
1976年 | 63篇 |
1975年 | 56篇 |
1974年 | 67篇 |
1972年 | 66篇 |
1971年 | 47篇 |
1970年 | 48篇 |
排序方式: 共有7524条查询结果,搜索用时 15 毫秒
31.
32.
33.
Carcinoma of the hepaticopancreatic ampullar region: role of US 总被引:3,自引:0,他引:3
Hepaticopancreatic ampullar tumors are so called because they are located at the confluence of the bile duct, pancreatic duct, and duodenum. Jaundice is an early sign of the disease and often leads to early diagnosis and favorable prognosis compared with other tumors that occur in this area. Of eight patients who underwent ultrasound (US) in the past 5 years, six (75%) were found to have tumor. The sizes of the tumors ranged from 1.6 to 2 cm. An intraluminal, polypoid mass in the distal part of the common bile duct was seen in four patients. In the other two patients, a sharply delineated mass gave rise to abrupt termination of the distal duct. Improved US resolution, more experience with this modality, and accurate diagnosis of these tumors with US will contribute to improved detection and prompt treatment. 相似文献
34.
Cameron Platell John Mackay Brian Collopy Roy Fink Peter Ryan Rodney Woods 《ANZ journal of surgery》1995,65(8):570-575
This study reviewed a series of patients with Crohn's disease managed by surgeons of the Department of Colon and Rectal Surgery, St Vincent's Hospital, Melbourne, since 1978. There were 306 patients: 171 males and 135 females. The mean age at diagnosis was 33.4 years (range 11–93). The distribution of the disease was small bowel 32.3%, small bowel and colon 26.5%, colon 39.9%, and anal disease alone 1.6%. A total of 416 abdominal operations were performed on 204 patients. The commonest indications for surgery were failed medical therapy (21.9%), small bowel obstruction (15.9%), enteric tistula (10.1%), and intra-abdominal abscess (10.1%). The most frequently performed procedures were ileocolic resection with anastomosis (28.8%), small bowel resection (9.4%), and total colectomy and ileostomy (7.0%). Postoperative complications included anastomotic leaks in 4.0%. intra-abdominal abscess formation in 3.6%, and enterocutaneous fistulae developed in 6%. Three patients died during the review period. During follow up (mean 84.4). 30% of patients developed recurrence requiring further surgery at a mean of 72.7 months postoperatively. The most frequent site for a recurrence was the pre-anastomotic terminal ileum (61.7%). In conclusion. the majority of patients with Crohn's disease will require resectional surgery at some stage. This can be performed with a low mortality and morbidity, and a recurrence rate of around 5% per year. 相似文献
35.
H M Cheng O S Singh K K Kwong J Xiong B T Woods T J Brady 《Optometry and vision science》1992,69(9):698-701
We have obtained multislice magnetic resonance (MR) images of the eye and calculated ocular dimensions along the three cardinal axes: antero-posterior (A-P), equatorial, and vertical. We found no difference in the shape of hyperopic (average refractive error: +3.72 D) and emmetropic eyes, both of which had an equatorial diameter longer than the A-P and vertical diameters. Myopic eyes (average refractive error: -6.54 D) were larger than hyperopic eyes, and most had the same spheroelliptical shape as that of the emmetropic and hyperopic eyes. The results suggest that during myopic progression an overall enlargement or a radial volume expansion has occurred. 相似文献
36.
Recurrent bilateral renal agenesis in siblings is very rare. Presented is a case diagnosed with sonographically aided amnioinfusion at 18 weeks in a woman with an infant affected with the same condition in a previous pregnancy. 相似文献
37.
38.
39.
Conventional follicle harvesting techniques for hair transplantation are limited by the available scalp donor hair. The development of an innovative technique of microsurgical single follicular unit extraction has made it possible to exploit body hair grafts for scalp transplantation. This case study reports on 18 months of follow-up on a patient with extensive scalp scarring who underwent a transplantation procedure using donor chest hair. The photographically documented results show a change in the length of the chest hair measuring an average of 4 cm at transplant to 15 cm by 18 months post-transplant. The transplanted chest grafts provided an excellent cosmetic result for hair replacement. 相似文献
40.