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   704851篇
  免费   49951篇
  国内免费   1299篇
耳鼻咽喉   9166篇
儿科学   23267篇
妇产科学   17615篇
基础医学   110401篇
口腔科学   19954篇
临床医学   63769篇
内科学   134328篇
皮肤病学   16161篇
神经病学   49474篇
特种医学   25738篇
外国民族医学   76篇
外科学   104470篇
综合类   14817篇
现状与发展   2篇
一般理论   160篇
预防医学   51396篇
眼科学   16318篇
药学   53952篇
  3篇
中国医学   2359篇
肿瘤学   42675篇
  2019年   5440篇
  2018年   7867篇
  2017年   6110篇
  2016年   6824篇
  2015年   7555篇
  2014年   10261篇
  2013年   15381篇
  2012年   20495篇
  2011年   21482篇
  2010年   12718篇
  2009年   11941篇
  2008年   19998篇
  2007年   21508篇
  2006年   21905篇
  2005年   20437篇
  2004年   19993篇
  2003年   18949篇
  2002年   18456篇
  2001年   36328篇
  2000年   36896篇
  1999年   30382篇
  1998年   7878篇
  1997年   6666篇
  1996年   6972篇
  1995年   6631篇
  1994年   6096篇
  1993年   5590篇
  1992年   22968篇
  1991年   22930篇
  1990年   22315篇
  1989年   22076篇
  1988年   20037篇
  1987年   19418篇
  1986年   18467篇
  1985年   17306篇
  1984年   12699篇
  1983年   10741篇
  1982年   5923篇
  1979年   11519篇
  1978年   8128篇
  1977年   6833篇
  1976年   6594篇
  1975年   7268篇
  1974年   8498篇
  1973年   8142篇
  1972年   7658篇
  1971年   7127篇
  1970年   6877篇
  1969年   6306篇
  1968年   5780篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
To determine the relationship between severity of illness and mortality, therapeutic intervention score (TISS) and acute physiology score (APS) were determined on admission to the Surgical Intensive Care Unit (SICU). Patients were divided into survivors and nonsurvivors and differences were compared by chi-square analysis. The 1524 patients admitted to the SICU during a 12-month period had a mean TISS of 3.03 and a mean APS of 13. The average length of stay (LOS) was 3.75 days. Of the 1524 patients, 97 (6.4%) died. The number of nonsurvivors increased with higher TISS and APS scores (P less than 0.001). There were no deaths in the TISS Category 1 patients or in the APS 0-5 group. Mortality rates dramatically increased with APS greater than 20 (P less than 0.001). There were 1286 patients with APS less than 20, and 24 (2%) of these patients died, whereas 73 (31%) of 238 patients with APS greater than 20 died. Nonsurvivors had a mean TISS of 3.6, mean APS of 27, and LOS of 4.88 days, all of which totals were higher than the survivors' totals. In this study population, risk of death was one in three if the APS was greater than 20. These data indicate that TISS and APS scores are effective means of assessing mortality risk in SICU patients.  相似文献   
992.
Successful treatment of an infected vascular graft with gentamicin beads   总被引:1,自引:0,他引:1  
This short report describes the successful healing of an infected axillo-bifemoral graft by the insertion of Gentamicin beads, this technique cannot be recommended for all infected grafts the majority of which will have to be removed and replaced.  相似文献   
993.
994.
Spontaneously elevated nociceptive threshold levels were markedly diminished after Naloxone injections in 4 patients with congenital insensitivity to pain. This finding suggested the hypothesis of a relation between congenital insensitivity to pain and permanent hyperfunction of an endomorphinic system. Radio-immunoassay of CSF beta-endorphin was performed in all 4 cases. The normal or only slightly elevated levels cannot explain electrophysiologic findings, but as a function of the multiplicity of endogenous opioid systems, hyperactivity of another endomorphinic system cannot be excluded. Other hypotheses may also be proposed.  相似文献   
995.
996.
In 1983-1984, 4578 Perth primary and secondary schoolchildren were studied. The selected sample was broadly representative of the ethnic groups that make up the Perth population and of the different social ranks within that population. The age, sex, weight, height, country of birth of the child and the parents, and occupation of the father were recorded for each subject. Weight, height and body mass index (BMI) increased with age. Age and sex were the most important determinants of body size. However, children of lower social rank and those with a southern European background were over-represented among the overweight children (greater than the 90th centile for BMI), particularly in adolescence. Children with an Asian background who were 11 years of age and younger were over-represented among the underweight children (less than or equal to the 10th centile for BMI). Results from this study indicate a continuing, though small (1.5 cm to 1.6 cm), secular increase in height over the past 13 to 14 years.  相似文献   
997.
998.
The health care supervisor responsible for establishing a therapeutic milieu within a traditional hospital organization will have greater success if these suggested management strategies are employed. Decentralizing, improving organizational communication, and clarifying interdisciplinary role relationships are the strategies that support the integration of differing organizational approaches to management.  相似文献   
999.
1000.
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