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   4275152篇
  免费   350877篇
  国内免费   15280篇
耳鼻咽喉   60882篇
儿科学   132863篇
妇产科学   111698篇
基础医学   654489篇
口腔科学   118685篇
临床医学   387310篇
内科学   774682篇
皮肤病学   103188篇
神经病学   366107篇
特种医学   170483篇
外国民族医学   912篇
外科学   651462篇
综合类   126073篇
现状与发展   23篇
一般理论   2578篇
预防医学   361918篇
眼科学   100365篇
药学   301607篇
  24篇
中国医学   11352篇
肿瘤学   204608篇
  2021年   55639篇
  2020年   35452篇
  2019年   58554篇
  2018年   73121篇
  2017年   55839篇
  2016年   62147篇
  2015年   75455篇
  2014年   110173篇
  2013年   175473篇
  2012年   117151篇
  2011年   120154篇
  2010年   122719篇
  2009年   125920篇
  2008年   107384篇
  2007年   113872篇
  2006年   123419篇
  2005年   118573篇
  2004年   119533篇
  2003年   110271篇
  2002年   100901篇
  2001年   154276篇
  2000年   150433篇
  1999年   139508篇
  1998年   71248篇
  1997年   67732篇
  1996年   65618篇
  1995年   61481篇
  1994年   55560篇
  1993年   51595篇
  1992年   103554篇
  1991年   98938篇
  1990年   94041篇
  1989年   91675篇
  1988年   85297篇
  1987年   83764篇
  1986年   79457篇
  1985年   77896篇
  1984年   65932篇
  1983年   58842篇
  1982年   48127篇
  1981年   44869篇
  1980年   42162篇
  1979年   57821篇
  1978年   47027篇
  1977年   41589篇
  1976年   38650篇
  1975年   37843篇
  1974年   42413篇
  1973年   40546篇
  1972年   38014篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
152.

Background  

The Association of Surgeons of Great Britain and Ireland (ASGBI) devised the electronic surgical logbook (version 2.4) for higher trainees in General Surgery enabling trainees to compile a uniform data set of their operative and training experience. This is in use by higher surgical trainees (HST) in the United Kingdom. This logbook permits trainees to submit data centrally into a Regional Analysis Database (RAD). With the implementation of the European Working Time Directive (EWTD) there is need for reliable data to assess the effects of the directive on training. In order to draw meaningful conclusions from the database the quality of data needs to be validated. We critically analysed the RAD in the Yorkshire region for a one-year period.  相似文献   
153.
On September 11, 2001 two hijacked airplanes struck the Twin Towers at the World Trade Center in New York City. All of the remains (19,915) were examined by the Office of Chief Medical Examiner (OCME) of New York City. The major goals of the OCME were to accurately identify the decedents and to promptly issue death certificates. As of September 2005, there were 1594 identifications of a total of 2749 people reported missing. Of these, 976 were identified by a single means, which included DNA analysis in 852 of the victims. Use of legal statues can assist in the timely issuance of death certificates in mass fatalities, which benefit surviving family members. DNA analysis markedly improves the ability to identify remains and has become the standard method for identification in these types of disasters. Certain postmortem tissue samples are better suited for DNA analysis and yield better results than others.  相似文献   
154.
155.
156.
We have carried out a prospective randomised, single blind clinical trial to investigate the effect of continuous passive motion on range of knee flexion, lack of extension, pain levels and analgesic use after total knee replacement surgery. 85 subjects were randomly allocated to control or study group. All subjects followed the existing rehabilitation protocol, which permits immediate active range of motion exercises and mobilisation with the study group using continuous passive motion for 1 h, twice a day. Outcome measures employed were range of motion, pain assessed on a visual analogue scale and analgesic use according to the WHO ladder. Blinded evaluation was carried out preoperatively, at time of discharge from hospital, 6 weeks, 6 and 12 months postoperation. No significant difference was observed between groups at all time intervals for each outcome variable using Wilcoxon Rank sum tests. The results substantiate previous findings that short duration continuous passive motion following total knee arthroplasty does not influence outcome of range of motion or reported pain.  相似文献   
157.
158.
159.
160.
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