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   14758篇
  免费   992篇
  国内免费   36篇
耳鼻咽喉   125篇
儿科学   609篇
妇产科学   460篇
基础医学   2139篇
口腔科学   256篇
临床医学   2053篇
内科学   2379篇
皮肤病学   284篇
神经病学   1652篇
特种医学   266篇
外科学   1010篇
综合类   156篇
现状与发展   1篇
一般理论   37篇
预防医学   2185篇
眼科学   220篇
药学   810篇
中国医学   11篇
肿瘤学   1133篇
  2023年   137篇
  2022年   153篇
  2021年   341篇
  2020年   253篇
  2019年   371篇
  2018年   372篇
  2017年   336篇
  2016年   294篇
  2015年   355篇
  2014年   509篇
  2013年   799篇
  2012年   1103篇
  2011年   1147篇
  2010年   583篇
  2009年   544篇
  2008年   992篇
  2007年   975篇
  2006年   1012篇
  2005年   997篇
  2004年   905篇
  2003年   836篇
  2002年   826篇
  2001年   109篇
  2000年   65篇
  1999年   110篇
  1998年   189篇
  1997年   149篇
  1996年   106篇
  1995年   110篇
  1994年   92篇
  1993年   77篇
  1992年   76篇
  1991年   48篇
  1990年   49篇
  1989年   40篇
  1988年   37篇
  1987年   26篇
  1986年   47篇
  1985年   45篇
  1984年   53篇
  1983年   66篇
  1982年   82篇
  1981年   54篇
  1980年   50篇
  1979年   32篇
  1978年   33篇
  1977年   21篇
  1976年   19篇
  1974年   22篇
  1972年   14篇
排序方式: 共有10000条查询结果,搜索用时 375 毫秒
51.
Abstract Client (patient) satisfaction has been studied extensively in the health care sector, yet those receiving home health care services have been the focus of few studies. The purpose of this study was to test the reliability and validity of the Home Care Client Satisfaction Instrument (HCCSI). A total of 400 clients, randomly selected from 20 randomly chosen home care agencies in one state, completed the HCCSI and demographic form. Most respondents were older adults with multiple health problems and their families or informal support systems. Since data were skewed, item analysis was used. The revised instrument (HCCSI-R) is unidimensional and includes 12 items rated on a 5-point Likert scale measuring specific aspects of care. In addition, there are three global measures of satisfaction rated on a 10-point scale. All items except one had significant item-total correlations greater than .59. The total score correlates with likeliness to recommend the agency to others (.37, p = .0001), showing some evidence for criterion-related validity.  相似文献   
52.
Tadpole and adult Xenopus, manipulated to be of comparable size, exhibited stagespecific antibody expression. The production of adult-type higher-affinity anti-DNP antibodies proved to be independent of the age and size of the individual and is concomitant with the completion of metamorphosis. The appearance of new antibody specificities at such a time suggests that their expression occurs with the cell turnover and renewal during a period of morphological changes.  相似文献   
53.
A bstract One etiology of unilateral lobar pulmonary edema is mitral regurgitation. Echocardiography is able to demonstrate the retrograde flow of blood into the pulmonary veins and allows timely diagnosis and treatment planning. Correction of mitral regurgitation is followed by resolution of the radiographic abnormality.  相似文献   
54.
The relationship between the use of cigarettes and other tobacco products and the risk of multiple myeloma was examined in a cohort of nearly 250,000 American veterans followed prospectively for 26 years. Compared with men who had never used tobacco, the risk of death from myeloma was not increased among current (relative risk [RR]=0.9, 95 percent confidence interval [CI]=0.8–1.2) or former (RR=1.0, CI=0.8–1.3) cigarette smokers, nor among users of chewing tobacco or snuff (RR=1.0, CI=0.4–2.3). Risk was only slightly and nonsignificantly increased among pipe or cigar smokers (RR=1.2, CI=0.9–1.5). There was no indication of increasing risk with amount of tobacco used or earlier age at first use. With over 90 percent power to detect a 30 percent increased risk of this tumor occuring among current cigarette smokers, this study provides the strongest evidence to date against an association of cigarette smoking with multiple myeloma.Epidemiology and Biometry Program, Division of Cancer Etiology, National Cancer Institute. Westat, Inc. Rockville, MD. National Cancer Institute, 6130 Executive Blvd, Room 418, Rockville, MD 20892, USA.  相似文献   
55.
A clinical discussion is presented of sources of sexual stress for women and how they might interfere with healthy sexual functioning. Several therapeutic techniques to reduce sexual stress are described and clinical case examples are given to clarify their use in clinical practice.  相似文献   
56.
57.
58.
Using a simple mathematical model, we calculated the risk for a patient undergoing penetrating keratoplasty to receive a cornea from a human immunodeficiency virus-infected donor despite negative results on serologic testing of donor serum. This error in serologic testing occurred when false-negative results were obtained from the enzyme-linked immunosorbent assay used to screen donor corneas for human immunodeficiency virus exposure. The average risk of transplanting an infected cornea was low, 0.03%, but increased by a factor of ten when donor tissue from donors at high risk for AIDS was used. Current screening procedures are probably adequate to prevent transmission of human immunodeficiency virus, but increased vigilance for high-risk donor populations may be appropriate.  相似文献   
59.
Postoperative nausea and vomiting (PONV) is a common and potentially debilitating complication of surgery. The preoperative assessment of PONV using established risk assessment tools enables the identification of patients at risk and potentially decreases the incidence of PONV in adult surgical patients. The identification of risk factors associated with PONV and the factors that are independent predictors of PONV preoperatively can facilitate the effective prophylactic treatment and management of PONV in adult surgical patients.  相似文献   
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