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   1002664篇
  免费   75826篇
  国内免费   2633篇
耳鼻咽喉   13042篇
儿科学   34618篇
妇产科学   28618篇
基础医学   145975篇
口腔科学   27804篇
临床医学   91122篇
内科学   194517篇
皮肤病学   22949篇
神经病学   79610篇
特种医学   38604篇
外国民族医学   305篇
外科学   150142篇
综合类   23834篇
一般理论   387篇
预防医学   78367篇
眼科学   22688篇
药学   72322篇
  3篇
中国医学   2034篇
肿瘤学   54182篇
  2018年   10632篇
  2017年   8300篇
  2016年   9447篇
  2015年   10684篇
  2014年   14547篇
  2013年   22165篇
  2012年   29226篇
  2011年   31095篇
  2010年   18641篇
  2009年   17550篇
  2008年   29026篇
  2007年   30696篇
  2006年   31210篇
  2005年   29899篇
  2004年   29152篇
  2003年   28005篇
  2002年   27040篇
  2001年   47137篇
  2000年   48236篇
  1999年   40408篇
  1998年   11250篇
  1997年   10162篇
  1996年   10224篇
  1995年   9825篇
  1994年   9135篇
  1993年   8533篇
  1992年   32389篇
  1991年   31565篇
  1990年   31136篇
  1989年   29980篇
  1988年   27262篇
  1987年   27401篇
  1986年   25512篇
  1985年   24685篇
  1984年   18459篇
  1983年   15564篇
  1982年   9320篇
  1981年   8418篇
  1979年   16913篇
  1978年   12272篇
  1977年   10351篇
  1976年   9788篇
  1975年   10213篇
  1974年   12356篇
  1973年   11914篇
  1972年   10937篇
  1971年   10147篇
  1970年   9410篇
  1969年   8749篇
  1968年   8127篇
排序方式: 共有10000条查询结果,搜索用时 41 毫秒
91.
92.
The objectives of this study were to investigate (1) changes in consumption of alcohol among pregnant women over a period of 5 years (1984/85–1990), (2) changes of attitudes towards drinking during pregnancy in the general population over the same period of time, and (3) possible connections between (1) and (2). The investigation was designed as a cross-sectional study. Our subjects were two representative samples of pregnant women in Oslo, n = 577 and 425, and two representative samples of the Norwegian population, n = 1004 and 1204. The main outcome measures were a self-completed questionnaire for the pregnant women and a personal interview for the general population sample. There was a significant reduction (50% decrease) in alcohol consumption among the second cohort of pregnant women compared with the first. Furthermore, we found an increase during the 5-year period in the number of persons with a restrictive attitude towards alcohol use during pregnancy. There seems to be a connection between these two phenomena, but with our present state of knowledge it is hard to say anything about the causal relationship between them.  相似文献   
93.
Corpus cavernosography in a patient with erectile dysfunction revealed absence of communication between the 2 cavernous bodies. No similar case was found in a review of 100 consecutive cavernosograms or in the literature. The abnormality may be a source of error in pressure recordings or in intravenous injection of pharmaceutical agents.  相似文献   
94.
95.
96.
The urological complications of 320 consecutive renal transplants performed at our institution between October 17, 1985 and November 10, 1989 are reviewed. The Leadbetter-Politano technique of ureteroneocystostomy was used in the first 160 patients (group 1) and an anterior extravesical technique modified from the methods of Witzel, Sampson and Lich was performed in the second 160 patients (group 2). Urological complications occurred in 15 patients (9.4%) in group 1 and 6 (3.7%) in group 2 (p = 0.04). Ureterovesical junction obstruction occurred in 6 patients (3.7%) in group 1 and 1 (0.6%) in group 2 (p = 0.05). Complications of leakage, ureteral necrosis and ureteral stricture were comparable in the 2 groups. Therefore, we advocate the use of the anterior extravesical technique over Leadbetter-Politano ureteral reimplantation based on the lower incidence of urological complications and various technical advantages, including less operative time, avoidance of a separate cystotomy, less hematuria and ability to use short donor ureters.  相似文献   
97.
98.
Preservation of the breast with a good or excellent cosmetic appearance is achievable in most patients. Careful attention to the details of surgical technique allows these procedures to be carried out easily and comfortably for the patient and the surgeon alike.  相似文献   
99.
A retrospective analysis of results of treatment of 104 patients with fractures of long tubular bones associated with injuries of peripheral nerves has shown complex therapy to be necessary. Main components of this treatment were biogenic stimulators, vitamin B12, spasmolytic and dehydration drugs in combination with electrophoresis with potassium iodide and thermal procedures. Rapid disturbance of conductivity of nerve trunks after trauma should be followed by revision of the given segment of the extremity in order to remove hematoma and make reposition of displaced fragments of the bone, which can provide recovery of the disturbed function of the nerve.  相似文献   
100.
Thirteen cases of primary appendicular adenocarcinoma are reported. This rare tumour usually presents as acute appendicitis. The correct diagnosis is rarely entertained before or during surgery. The main treatment choice lies between appendicectomy alone and appendicectomy followed by right hemicolectomy. There are anatomical reasons for advising the latter and survival figures from the literature tend to support this preference. The cases reported here indicate that in the period 1972-1984, in the North West Region, there was a slight preference for appendicectomy alone. The additional procedure of right hemicolectomy did not confer any clear-cut survival advantage.  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