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   24746篇
  免费   6123篇
  国内免费   71篇
耳鼻咽喉   567篇
儿科学   767篇
妇产科学   902篇
基础医学   1371篇
口腔科学   1264篇
临床医学   4251篇
内科学   8021篇
皮肤病学   642篇
神经病学   1562篇
特种医学   519篇
外科学   2690篇
综合类   80篇
现状与发展   3篇
一般理论   1篇
预防医学   4180篇
眼科学   345篇
药学   638篇
中国医学   47篇
肿瘤学   3090篇
  2024年   136篇
  2023年   1102篇
  2022年   507篇
  2021年   904篇
  2020年   1357篇
  2019年   662篇
  2018年   1348篇
  2017年   1378篇
  2016年   1624篇
  2015年   1594篇
  2014年   2274篇
  2013年   2543篇
  2012年   1233篇
  2011年   1145篇
  2010年   1433篇
  2009年   1808篇
  2008年   1023篇
  2007年   823篇
  2006年   1172篇
  2005年   764篇
  2004年   639篇
  2003年   522篇
  2002年   437篇
  2001年   405篇
  2000年   389篇
  1999年   377篇
  1998年   393篇
  1997年   299篇
  1996年   285篇
  1995年   239篇
  1994年   185篇
  1993年   152篇
  1992年   200篇
  1991年   156篇
  1990年   171篇
  1989年   144篇
  1988年   128篇
  1987年   117篇
  1986年   102篇
  1985年   101篇
  1984年   87篇
  1983年   91篇
  1982年   42篇
  1981年   39篇
  1980年   36篇
  1979年   38篇
  1978年   33篇
  1977年   34篇
  1976年   38篇
  1974年   35篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
51.
We review the association between surgically resolvable aortic disease and horseshoe kidney with a discussion of diagnostic problems and therapeutic options.Male patient 81 years of age with horseshoe kidney and an abdominal aortic aneurysm that was discovered by chance in an abdominal ultrasound during a check-up for his prostate condition.A retroperitoneal approach was used in order to resect the aneurysm and perform an aorto-aortic bypass with no complications occurring. Two years after the diagnosis, the patient is still asymptomatic from a vascular point of view.The co-presence of horseshoe kidney and aortic disease needing surgical correction is infrequent, but it significantly increases the technical complexity of aortic reconstruction. A literature review is included.  相似文献   
52.
53.
54.
55.
Bulimia is a distinct diagnostic eating disorder with its most noted manifestation being the rapid ingestion of large quantities of food followed by its elimination through the mouth. Because of the dental implications of highly acidic stomach contents chronically being regurgitated, the dentist is in a unique position to help identify the patient with bulimia. Dental erosion is not only the most easily noted but also the most destructive of the many oral problems caused by bulimia. This report of case describes a preventive dental prosthesis that can be used by the patient with bulimia to protect those teeth that are most affected by dental erosion. The construction of the prosthesis is easily completed with materials in the dental office and provides a great service to the patient with bulimia.  相似文献   
56.
57.
58.
Objectives: Little is known about recent trends in U.S. emergency department (ED) visits for acute exacerbation of chronic obstructive pulmonary disease (AECOPD) or about ED management of AECOPD. This study aimed to describe the epidemiology of ED visits for AECOPD and to evaluate concordance with guideline‐recommended care. Methods: Data were obtained from National Hospital Ambulatory Medical Care Survey (NHAMCS). ED visits for AECOPD, during 1993 to 2005, were identified using the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD‐9‐CM) codes. Concordance with guideline recommendations was evaluated using process measures. Results: Over the 13‐year study period, there was an average annual 0.6 million ED visits for AECOPD, and the visit rates for AECOPD were consistently high (3.2 per 1,000 U.S. population; Ptrend = 0.13). The trends in the use of chest radiograph, pulse oximetry, or bronchodilator remained stable (all Ptrend > 0.5). By contrast, the use of systemic corticosteroids increased from 29% in 1993–1994 to 60% in 2005, antibiotics increased from 14% to 42%, and methylxanthines decreased from 15% to <1% (all Ptrend < 0.001). Multivariable analysis showed patients in the South (vs. the Northeast) were less likely to receive systemic corticosteroids (odds ratio [OR] = 0.6; 95% confidence interval [CI] = 0.4 to 0.9). Conclusions: The high burden of ED visits for AECOPD persisted. Overall concordance with guideline‐recommended care for AECOPD was moderate, and some emergency treatments had improved over time.  相似文献   
59.
As the proportion of racial, ethnic, and cultural minorities in the United States continues to expand, pediatric emergency medicine providers are increasingly likely to encounter cultural and language barriers in practice. This paper reviews a conceptual framework encompassing the decision to seek emergency care, the process of providing such care, and the adherence to treatment plans and follow-up. The ways in which cultural and language barriers can negatively impact each element of this model are discussed in detail. Specific examples include provider ignorance of dangerous folk beliefs, communication barriers secondary to inappropriate interpreter use, and discriminatory assumptions regarding child abuse, pain management, and sexual activity. The practitioner is then provided with concrete recommendations to reduce these negative effects.  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