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   23546篇
  免费   6074篇
  国内免费   129篇
耳鼻咽喉   670篇
儿科学   727篇
妇产科学   736篇
基础医学   593篇
口腔科学   2690篇
临床医学   4298篇
内科学   5478篇
皮肤病学   496篇
神经病学   2007篇
特种医学   1082篇
外科学   4083篇
综合类   134篇
现状与发展   12篇
预防医学   2870篇
眼科学   557篇
药学   515篇
中国医学   17篇
肿瘤学   2784篇
  2024年   165篇
  2023年   1103篇
  2022年   402篇
  2021年   691篇
  2020年   1235篇
  2019年   528篇
  2018年   1372篇
  2017年   1317篇
  2016年   1551篇
  2015年   1607篇
  2014年   2022篇
  2013年   2457篇
  2012年   940篇
  2011年   891篇
  2010年   1432篇
  2009年   2019篇
  2008年   840篇
  2007年   613篇
  2006年   752篇
  2005年   555篇
  2004年   424篇
  2003年   375篇
  2002年   327篇
  2001年   437篇
  2000年   343篇
  1999年   454篇
  1998年   529篇
  1997年   498篇
  1996年   553篇
  1995年   403篇
  1994年   312篇
  1993年   275篇
  1992年   238篇
  1991年   208篇
  1990年   190篇
  1989年   191篇
  1988年   149篇
  1987年   158篇
  1986年   134篇
  1985年   124篇
  1984年   106篇
  1983年   119篇
  1982年   94篇
  1981年   81篇
  1980年   62篇
  1979年   54篇
  1978年   51篇
  1977年   52篇
  1976年   44篇
  1973年   51篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Due to recent public debate and newly imposed resident work hour restrictions, we decided to investigate the relationship of resident call status to their ambulatory patients' satisfaction. Resident continuity clinic patients were asked to rate their level of satisfaction on a 10-point Likert-type scale. Using multiple regression approaches, these data were then assessed as a function of resident call status. We found that in 646 patient encounters, patient satisfaction scores were significantly less when the resident was postcall, 8.99 ± 1.8, than when not postcall, 9.31 ± 1.3. We herein discuss etiologies and implications of these findings for both patient care and medical education.  相似文献   
82.
83.
84.
Frontal intracerebral haemorrhage (ICH) is a common result of cranial trauma. Outcome differences between bilateral and unilateral frontal ICH are not well studied but would be valuable to predict prognosis in clinical practice. Two aims are proposed in this study: first to compare the risk of developing delayed ICH after bilateral or unilateral frontal ICH, and second to determine the variables helpful to predict outcome according to the Glasgow Outcome Scale (GOS). Between January 1993 and December 1997, 694 consecutive patients with traumatic ICH were admitted to the Chang Gung Medical Center within 24 h of the trauma. Patients with ICH in sites other than the frontal lobes were excluded. A total of 161 cases (mean age 46.3+/-20.3 years), including 57 bilateral (mean age 52.5+/-18.7 years) and 104 unilateral (mean age 42.9+/-20.5 years) traumatic frontal ICH were studied. Twenty-eight of 57 patients (49%) with bifrontal ICH versus 17 of 104 patients (16%) with unilateral frontal ICH had a further, delayed ICH. In 42 of 45 patients (93%) with delayed ICH, this occurred within 5 days of the initial trauma. Multivariate logistic regression was used to select significant predictors of outcome. We found that delayed ICH (p<0.001), age (p=0.004) and mechanism of injury (p=0.001) explained the worse outcome in patients with bifrontal ICH. The best-fitting logistic regression model included three variables: delayed ICH (p=0.011), initial GCS (p=0.023), and a sum score of clinical and radiological variables (p=0.003). Bifrontal ICH tended to occur in older patients after a fall and was associated with a higher risk of developing delayed ICH or brain stem compression compared to unilateral ICH damage. Using these three variables - delayed ICH, initial GCS, and the sum score - in a logistical regression model is useful to predict outcome in patients with traumatic frontal ICH and may aid patient management.  相似文献   
85.
86.
Objective To evaluate parents’ fruit and vegetable intake and their use of pressure to eat in child feeding as predictors of their 5-year-old daughters’ fruit and vegetable, micronutrient, and fat intakes.Subjects Data were obtained from 191 non-Hispanic white families with 5-year-old girls.Design Parent data included reports of pressure in child feeding and their own fruit and vegetable intake. Girls’ intakes of fruits and vegetables, selected micronutrients, and fat were the main outcomes of interest.Statistical analysis Structural equation modeling was used to test a model describing relationships among parents’ fruit and vegetable intake, parents’ use of pressure in child feeding, and daughters’ fruit and vegetable, micronutrient, and fat intakes.Results The model provided a good fit to the data, revealing that girls’ fruit and vegetable intake was positively related to their parents’ reported fruit and vegetable intake. Parents who consumed fewer fruits and vegetables tended to report greater pressure in child feeding and had daughters who consumed fewer fruits and vegetables. Girls’ reported fruit and vegetable intakes were positively related to their micronutrient intakes and negatively associated with fat intake.Applications/conclusions This research demonstrates that parents’ own fruit and vegetable intake may encourage fruit and vegetable intake in their daughters, leading to higher micronutrient intakes and lower dietary fat intakes. Conversely, pressure to eat may discourage fruit and vegetable intake among young girls. J Am Diet Assoc. 2002;102:58–64.  相似文献   
87.
88.
89.
90.
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