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   19939篇
  免费   1749篇
  国内免费   134篇
耳鼻咽喉   217篇
儿科学   568篇
妇产科学   471篇
基础医学   2464篇
口腔科学   462篇
临床医学   2412篇
内科学   3529篇
皮肤病学   211篇
神经病学   1957篇
特种医学   585篇
外科学   2540篇
综合类   604篇
一般理论   24篇
预防医学   2124篇
眼科学   474篇
药学   1564篇
中国医学   16篇
肿瘤学   1600篇
  2022年   129篇
  2021年   262篇
  2020年   183篇
  2019年   256篇
  2018年   335篇
  2017年   256篇
  2016年   302篇
  2015年   335篇
  2014年   430篇
  2013年   676篇
  2012年   990篇
  2011年   965篇
  2010年   546篇
  2009年   498篇
  2008年   886篇
  2007年   1010篇
  2006年   880篇
  2005年   885篇
  2004年   866篇
  2003年   796篇
  2002年   820篇
  2001年   624篇
  2000年   585篇
  1999年   519篇
  1998年   303篇
  1997年   231篇
  1996年   256篇
  1995年   221篇
  1994年   205篇
  1993年   194篇
  1992年   403篇
  1991年   389篇
  1990年   429篇
  1989年   388篇
  1988年   378篇
  1987年   365篇
  1986年   355篇
  1985年   305篇
  1984年   242篇
  1983年   196篇
  1982年   138篇
  1981年   124篇
  1979年   236篇
  1978年   158篇
  1977年   137篇
  1976年   128篇
  1975年   146篇
  1974年   165篇
  1973年   131篇
  1972年   117篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
A modified end-point enzymatic method for the measurement of ammonia in stool water is presented. A protein precipitation step was included in order to inactivate urease and faecal enzymes, which oxidise NADH. The modified method is reliable, with acceptable precision and accuracy, and is linear up to a concentration of 1.5 mmol/l.  相似文献   
52.
53.
BACKGROUND: Nurse leaders in Fiji are currently involved in meeting the challenges of being at the forefront of an AusAID supported Health Sector Improvement process. Fiji is experiencing the same shortages of health professionals (including nurses) as is occurring internationally, while simultaneously striving to improve the quality of its health services. PRIMARY ARGUMENT: This paper provides information about the current situation in relation to health services in Fiji, and describes strategies being undertaken by the nurse leaders of Fiji to meet the challenge of leading an exciting reform process. James Cook University, School of Nursing Sciences, has been privileged to support the provision of contemporary leadership and management education for current and future nurse leaders in the Fiji Health Sector as a component of a current education program to educate registered nurses to bachelor level. This paper will provide an overview of the current Fiji Health Sector Improvement Program, with a particular focus on the preparation of nurse leaders. CONCLUSION: There is an ongoing need to understand beliefs and values, and styles of interaction and communication, and indeed, ideas about time. With collaboration between Australian academics and Fiji tutors from the Fiji School of Nursing, the program appears to be remarkably successful.  相似文献   
54.
55.
56.
57.
BACKGROUND: Parallel comparison studies of cognitive therapy and antidepressant medication have suggested that both treatments are effective. However, we cannot determine from these studies whether cognitive therapy and antidepressant medication are effective for the same populations of depressives. A sequential study in which nonresponders to the first treatment are then treated with the second can address this issue. METHOD: Twenty-seven patients meeting DSM-III criteria for major depression or dysthymic disorder and Columbia criteria for atypical depression received cognitive therapy followed by antidepressant medication for cognitive therapy nonresponders. A response rate with the second treatment equal to that expected with placebo would suggest both treatments target the same depressive population. RESULTS: Of the 25 completers of the study, 14 (56%) were judged responders to cognitive therapy alone. Sixty-nine percent (9/13) of the responders maintained their benefits for 6 months or more. Seven of the 11 cognitive therapy nonresponders (63%) responded to antidepressant medication. These results were compared with those of a concurrent double-blind medication study; both its sample and ours were drawn from the same population at the same time: cognitive therapy and antidepressant medication response rates were higher than expected with placebo (28%). CONCLUSION: The results suggest that (1) cognitive therapy and antidepressant medication are effective treatments for differing populations of depressed patients, as the antidepressant medication response of cognitive therapy nonresponders was greater than expected with placebo, and (2) cognitive therapy has a lasting effect.  相似文献   
58.
59.
60.
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