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   460814篇
  免费   42528篇
  国内免费   32260篇
耳鼻咽喉   3630篇
儿科学   6111篇
妇产科学   5068篇
基础医学   49751篇
口腔科学   7486篇
临床医学   64785篇
内科学   61782篇
皮肤病学   4924篇
神经病学   21880篇
特种医学   16767篇
外国民族医学   266篇
外科学   40524篇
综合类   87536篇
现状与发展   93篇
一般理论   39篇
预防医学   34655篇
眼科学   12642篇
药学   51215篇
  518篇
中国医学   30722篇
肿瘤学   35208篇
  2024年   1540篇
  2023年   6544篇
  2022年   17410篇
  2021年   21983篇
  2020年   17427篇
  2019年   14124篇
  2018年   14799篇
  2017年   14282篇
  2016年   13063篇
  2015年   20539篇
  2014年   25570篇
  2013年   23444篇
  2012年   34946篇
  2011年   39043篇
  2010年   26761篇
  2009年   21745篇
  2008年   26486篇
  2007年   26153篇
  2006年   25008篇
  2005年   23619篇
  2004年   15958篇
  2003年   15461篇
  2002年   12804篇
  2001年   10938篇
  2000年   10347篇
  1999年   10315篇
  1998年   6542篇
  1997年   6323篇
  1996年   4839篇
  1995年   4550篇
  1994年   3854篇
  1993年   2436篇
  1992年   2961篇
  1991年   2593篇
  1990年   2162篇
  1989年   1909篇
  1988年   1547篇
  1987年   1424篇
  1986年   1149篇
  1985年   819篇
  1984年   458篇
  1983年   328篇
  1982年   186篇
  1981年   220篇
  1980年   157篇
  1979年   184篇
  1978年   100篇
  1977年   69篇
  1976年   47篇
  1974年   55篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
田方  石文 《中国当代儿科杂志》2015,17(10):1142-1147
动脉导管未闭(PDA)是早产儿常见疾病,目前早产儿PDA的自然发展过程仍未完全明确,PDA发生的有些高危因素仍存在争议,对PDA是否进行药物、手术干预,以及何时进行药物、手术干预仍存在争议。尽管已经有相当多的证据证实动脉导管持续开放可能有害,但目前尚缺乏关闭导管治疗方案的远期益处或害处的相关证据。大多数临床试验旨在评估短期导管开放对患儿的影响。目前尚无评估动脉导管持续开放对早产儿死亡率及并发症影响的临床试验。近年来PDA治疗上最大的变化是减少对PDA的治疗。该文重点总结胎龄28周早产儿PDA的治疗策略。  相似文献   
3.
4.
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   
5.
6.
7.
8.
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   
9.
置身RAIN CLUB的超凡境地中,美食、美酒和美妙的音乐是智灵的洗净,像干燥的北京城迎来第一场春天的“润”——稍显奢华。[编者按]  相似文献   
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