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   22709篇
  免费   1369篇
  国内免费   42篇
耳鼻咽喉   154篇
儿科学   714篇
妇产科学   754篇
基础医学   2863篇
口腔科学   318篇
临床医学   3643篇
内科学   3794篇
皮肤病学   208篇
神经病学   2341篇
特种医学   402篇
外科学   2008篇
综合类   279篇
一般理论   34篇
预防医学   3377篇
眼科学   329篇
药学   1332篇
  1篇
中国医学   28篇
肿瘤学   1541篇
  2024年   15篇
  2023年   153篇
  2022年   236篇
  2021年   433篇
  2020年   302篇
  2019年   452篇
  2018年   549篇
  2017年   418篇
  2016年   465篇
  2015年   552篇
  2014年   759篇
  2013年   1143篇
  2012年   1675篇
  2011年   1823篇
  2010年   953篇
  2009年   852篇
  2008年   1556篇
  2007年   1686篇
  2006年   1574篇
  2005年   1559篇
  2004年   1556篇
  2003年   1413篇
  2002年   1398篇
  2001年   224篇
  2000年   149篇
  1999年   182篇
  1998年   262篇
  1997年   227篇
  1996年   159篇
  1995年   178篇
  1994年   157篇
  1993年   120篇
  1992年   109篇
  1991年   85篇
  1990年   64篇
  1989年   65篇
  1988年   58篇
  1987年   57篇
  1986年   44篇
  1985年   68篇
  1984年   57篇
  1983年   50篇
  1982年   61篇
  1981年   54篇
  1980年   33篇
  1979年   19篇
  1978年   16篇
  1977年   16篇
  1976年   9篇
  1974年   11篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
    
We present our comments on the above article.  相似文献   
14.
15.
There is evidence that long-term maintenance of a low-fat diet reduces preference for high-fat foods. Sensory evaluation of the taste of fat, and preference for high and low-fat foods were studied in a group of former participants in a randomized dietary intervention trial aimed at lowering fat consumption. Intervention subjects consuming less than 25% of daily calories as fat and control subjects consuming more than 35% of daily calories as fat agreed to be in a "taste perception" study. In Study 1, subjects tasted 20 dairy solutions containing different levels of fat and sugar. Subjects rated the perceived intensity of fat taste, and of liking, for each of the solutions. In Study 2, subjects were asked to taste and rate 4 high-fat and 4 low-fat snack foods, and were then allowed to freely consume these foods in a preference test. Intervention and control subjects were similar in their sensory evaluation of the taste of fat in Study 1. In Study 2, intervention subjects reported a reduced hedonic rating of the taste of high-fat snack foods compared to control subjects, yet intervention subjects consumed the same amount of high-fat snack foods as control subjects. We conclude that a successful outcome in a dietary intervention may be due to social and cognitive factors, in addition to potential changes in hedonic response to fat.  相似文献   
16.
A model for training the trainers of child care providers that employs Vygotsky's framework of the Zone of Proximal Development is described. This efficient training mechanism proposes mentoring relationships as a means to meet the developmental needs of experienced child care professionals and improve the quality of existing child care programs.The authors would like to thank Dr. Bille Thomas and the satellite resource center directors and staff members for their work on the project.  相似文献   
17.
This double-blind study compared ampicillin-sulbactam 3 g versus cefoxitin 2 g in 136 adult patients at risk for developing an infection after abdominal surgery. Separate randomization schedules were used for colorectal, upper gastrointestinal/biliary, and other abdominal procedures. Study antibiotics were administered within 30 minutes before incision and repeated 6 hours later. Patients having colorectal surgery received a third dose of antibiotic 6 hours after the second. Efficacy evaluations were made on 123 patients, 62 in the ampicillin-sulbactam group and 61 in the cefoxitin group. The overall postoperative infection rates were 12.9% for ampicillin-sulbactam and 9.8% for cefoxitin (p>0.05); one wound infection occurred in each group. Adverse events were experienced by 13.2% of the ampicillin-sulbactam and 19.1% of the cefoxitin recipients (p>0.05). Cost-minimization analysis revealed that ampicillin-sulbactam was a cost-effective alternative to cefoxitin for the prevention of infection after abdominal surgery.  相似文献   
18.
19.
Research investigating predictors of risky sexual behavior of rural MSM is sparse, even though the prevalence of HIV in rural areas has increased. This study explored two sets of predictors of 93 rural MSM's levels of risky sexual behavior: mental health variables and stigma emanating from men's family members, health care professionals, and people in the rural communities in which they live. Over 47% of the men were found to be at modified high to high risk. Logistic regression using a continuation logit model was used to test the relationship of the predictor variables and the four levels of risk. Findings indicate that self-esteem was predictive of the highest sexual risk behavior but not lower levels of risk. Stigma was predictive of modified high sexual risk when compared to low and no risk categories. No variables differentiated men at low risk from men at no risk.  相似文献   
20.
A drinking water supply is a complicated system in its construction,operation,maintenance and need for public health surveillance.  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