首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   543940篇
  免费   35629篇
  国内免费   26077篇
耳鼻咽喉   3958篇
儿科学   11371篇
妇产科学   7116篇
基础医学   56702篇
口腔科学   7647篇
临床医学   65009篇
内科学   80505篇
皮肤病学   4766篇
神经病学   33970篇
特种医学   22537篇
外国民族医学   224篇
外科学   61248篇
综合类   71961篇
现状与发展   86篇
一般理论   31篇
预防医学   45243篇
眼科学   13351篇
药学   49672篇
  441篇
中国医学   25025篇
肿瘤学   44783篇
  2024年   1289篇
  2023年   5472篇
  2022年   14442篇
  2021年   18391篇
  2020年   14478篇
  2019年   11827篇
  2018年   33052篇
  2017年   28291篇
  2016年   29504篇
  2015年   17720篇
  2014年   21729篇
  2013年   19796篇
  2012年   35063篇
  2011年   52111篇
  2010年   39657篇
  2009年   28660篇
  2008年   40354篇
  2007年   42335篇
  2006年   20609篇
  2005年   21330篇
  2004年   15913篇
  2003年   16436篇
  2002年   12417篇
  2001年   8793篇
  2000年   8731篇
  1999年   8549篇
  1998年   5496篇
  1997年   5293篇
  1996年   4044篇
  1995年   3812篇
  1994年   3230篇
  1993年   2084篇
  1992年   2462篇
  1991年   2208篇
  1990年   1912篇
  1989年   1629篇
  1988年   1333篇
  1987年   1220篇
  1986年   976篇
  1985年   704篇
  1984年   387篇
  1983年   291篇
  1982年   166篇
  1981年   169篇
  1980年   153篇
  1979年   156篇
  1978年   81篇
  1974年   61篇
  1938年   62篇
  1932年   61篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Patients with mechanic ankle instability experience increased tibiotalar and subtalar joint laxity. However, in vivo joint kinematics in functional ankle instability (FAI) patients and lateral ankle sprain (LAS) copers, especially during dynamic activities, are poorly understood. Ten FAI patients, 10 LAS copers, and 10 healthy controls were included in this study. A dual fluoroscopic imaging system was used to analyze the tibiotalar and subtalar joint kinematics during stair descent. Five key poses of stair descent were analyzed. Kinematic data from six degrees of freedom were calculated utilizing a solid modeling software. The range of motion and joint positions in each degree of freedom were compared among the three groups. The tibiotalar joints of FAI patients and LAS copers were significantly more inverted than those of healthy controls during the foot strike (p = 0.016, = 0.264). The subtalar joints of FAI patients were significantly more anteriorly translated (pose 2, p = 0.003, = 0.352; pose 3, p < 0.001, = 0.454; pose 4, p = 0.004, = 0.334), inverted (pose 4, p = 0.027, = 0.234; pose 5,p = 0.034, = 0.221), and externally rotated (pose 4, p = 0.037, = 0.217; pose 5; p = 0.004, = 0.331) than those of healthy controls during the mid‐stance and the heel off. The FAI patients showed excessive tibiotalar inversion and subtalar joint hypermobility during stair descent. Meanwhile, the LAS copers maintained subtalar joint stability, and only showed excessive tibiotalar inversion in foot strike. These data provide insight into the mechanisms behind the development of FAI after initial LAS. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1860–1867, 2019  相似文献   
3.
4.
5.
6.
目的 探讨膀胱肿瘤并前列腺增生症患者同期施行膀胱肿瘤切除术和保留尿道粘膜前列腺切除术的可行性.方法 对同期施行经尿道膀胱肿瘤切除术及保留尿道粘膜前列腺切除术的16例膀胱癌合并前列腺增生症患者的临床资料进行了回顾性分析.结果 该组患者均顺利康复,无明显合并症,术后复诊,随访时间2~4年,3例出现肿瘤复发.结论 同期施行膀胱肿瘤切除术和保留尿道粘膜前列腺切除术,安全、效果肯定,值得基层医院推广应用.  相似文献   
7.
8.
9.
10.
The objective of this study is to assess the efficacy and safety of herbal medicines (HMs), as a monotherapy or adjunct therapy, compared to placebo or conventional approaches in the treatment of idiopathic Parkinson's disease (PD). We conducted a systematic review of randomized controlled trials from both conventional and alternative medicine sources. Outcome measures were overall improvement, quality of life, reduction of levodopa dose, and adverse events. Nine studies were included, each testing a different HM. Six of the trials had limited internal validity due to major flaws in design, including the lack of proper randomization; insufficient blinding; unclear inclusive criteria in terms of diagnostic criteria, baseline staging, and duration of disease; lack of proper sample size calculation; and insufficient data analysis. Imbalances in gender and ethnicity among the patients in the included trials were observed. No major adverse events emerged, and no specific pattern was detected from the trials describing such data. In addition to major methodological defects, heterogeneity in (1) HM tested, (2) control treatment, and (3) outcome measure hindered in-depth data analysis and synthesis. Current evidence is insufficient to evaluate the efficacy and safety of various HMs. Further studies with improved trial design and reporting, with assessment on cost-effectiveness, quality of life, and qualitative data are warranted.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号