全文获取类型
收费全文 | 2117篇 |
免费 | 222篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 110篇 |
妇产科学 | 35篇 |
基础医学 | 214篇 |
口腔科学 | 78篇 |
临床医学 | 286篇 |
内科学 | 416篇 |
皮肤病学 | 26篇 |
神经病学 | 96篇 |
特种医学 | 293篇 |
外科学 | 267篇 |
综合类 | 57篇 |
预防医学 | 188篇 |
眼科学 | 66篇 |
药学 | 101篇 |
肿瘤学 | 117篇 |
出版年
2020年 | 17篇 |
2019年 | 29篇 |
2018年 | 43篇 |
2017年 | 20篇 |
2016年 | 26篇 |
2015年 | 32篇 |
2014年 | 52篇 |
2013年 | 49篇 |
2012年 | 54篇 |
2011年 | 66篇 |
2010年 | 65篇 |
2009年 | 42篇 |
2008年 | 54篇 |
2007年 | 69篇 |
2006年 | 55篇 |
2005年 | 56篇 |
2004年 | 41篇 |
2003年 | 62篇 |
2002年 | 42篇 |
2001年 | 50篇 |
2000年 | 55篇 |
1999年 | 44篇 |
1998年 | 84篇 |
1997年 | 82篇 |
1996年 | 90篇 |
1995年 | 61篇 |
1994年 | 46篇 |
1993年 | 60篇 |
1992年 | 64篇 |
1991年 | 40篇 |
1990年 | 45篇 |
1989年 | 68篇 |
1988年 | 63篇 |
1987年 | 60篇 |
1986年 | 55篇 |
1985年 | 69篇 |
1984年 | 31篇 |
1983年 | 29篇 |
1982年 | 28篇 |
1981年 | 27篇 |
1980年 | 18篇 |
1979年 | 20篇 |
1978年 | 27篇 |
1977年 | 40篇 |
1976年 | 30篇 |
1975年 | 28篇 |
1974年 | 19篇 |
1973年 | 21篇 |
1972年 | 20篇 |
1970年 | 17篇 |
排序方式: 共有2371条查询结果,搜索用时 15 毫秒
1.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome. 相似文献
2.
3.
4.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
5.
6.
Superficial bladder cancer: intravesical chemotherapy and tumour progression to muscle invasion or metastases 总被引:2,自引:0,他引:2
G Smith R A Elton G D Chisholm J E Newsam T B Hargreave 《British journal of urology》1986,58(6):659-663
Of 299 patients who presented with superficial bladder cancer (Ta, T1), 60 were treated by intravesical chemotherapy (Epodyl, methotrexate or mitomycin C). The rate of tumour progression to muscle invasion or metastases was identical for each intravesical regime. There was no evidence that mitomycin C promoted tumour progression. Carcinoma in situ in non-tumour-bearing urothelium was the most significant predictive factor for progression to muscle invasion or metastases. 相似文献
7.
8.
9.
10.
BACKGROUND: Many patients with asthma or chronic obstructive pulmonary diseaseuse their medication inhalers incorrectly. General practitioners,pharmacists and other health care providers do not always havethe opportunity to instruct patients in correct inhaler technique. OBJECTIVE: To find out whether the inhaler technique and respiratory symptomsof patients can be improved after instruction by practice assistants. METHODS: Single blind, randomized intervention study in which 48 patientswho had been using a dry powder inhaler for at least one monthtook part. Their inhaler technique was videotaped on two visitswith a two-week interval between visits. The inhaler techniqueon the videos was subsequently scored by two experts on ninecriteria. At both visits the patients completed a questionnaireabout their respiratory symptoms. After the first video, 25patients were randomly chosen to receive instruction from oneof six practice assistants who had followed a one evening courseabout inhaler instruction, and who had been issued an instruction-set. RESULTS: The patients who received instruction had a significantly greaterreduction in number of mistakes at the second visit than thepatients who did not (P = 0.01). The instructed patients alsoreported less dyspnoea at the second visit (P = 0.03). No effectof instruction was found on wheezing, cough and sputum production. CONCLUSION: The inhaler technique of patients can be improved significantlyby the instruction of patients by trained practice assistants,possibly resulting in less dyspnoea. Keywords. Administration-inhalation, obstructive lung diseases, airways symptoms, patient-education, general practice. 相似文献