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   21975篇
  免费   5691篇
  国内免费   136篇
耳鼻咽喉   631篇
儿科学   644篇
妇产科学   719篇
基础医学   398篇
口腔科学   2679篇
临床医学   4208篇
内科学   5213篇
皮肤病学   462篇
神经病学   1872篇
特种医学   1022篇
外科学   3844篇
综合类   101篇
现状与发展   12篇
预防医学   2773篇
眼科学   351篇
药学   264篇
中国医学   10篇
肿瘤学   2599篇
  2024年   163篇
  2023年   1104篇
  2022年   394篇
  2021年   677篇
  2020年   1241篇
  2019年   517篇
  2018年   1372篇
  2017年   1307篇
  2016年   1525篇
  2015年   1582篇
  2014年   2000篇
  2013年   2391篇
  2012年   820篇
  2011年   781篇
  2010年   1385篇
  2009年   1963篇
  2008年   761篇
  2007年   527篇
  2006年   662篇
  2005年   468篇
  2004年   341篇
  2003年   302篇
  2002年   274篇
  2001年   390篇
  2000年   281篇
  1999年   384篇
  1998年   500篇
  1997年   484篇
  1996年   535篇
  1995年   389篇
  1994年   300篇
  1993年   260篇
  1992年   180篇
  1991年   157篇
  1990年   146篇
  1989年   148篇
  1988年   135篇
  1987年   128篇
  1986年   104篇
  1985年   93篇
  1984年   76篇
  1983年   89篇
  1982年   82篇
  1981年   67篇
  1980年   45篇
  1979年   33篇
  1978年   35篇
  1977年   43篇
  1976年   31篇
  1975年   28篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.
Occupational exposure to HIV is becoming a daily hazard in many emergency departments. Emergency physicians who are protected by disability insurance policies are likely to believe that if they are unable to continue working because of HIV-positive status, their disability policies will provide them with a source of income. Unfortunately, analysis of case law regarding claims under disability policies shows that the law is unlikely to consider an asymptomatic, HIV-positive physician disabled for purposes of payments under disability policies. Therefore, it is necessary for emergency physicians to make sure this issue is resolved before buying and relying on a disability policy so that an anticipated safety net will be operative over the full range of hazards that emergency physicians face.[Lavely R: The HIV-positive physician and disability insurance. Ann Emerg Med June 1994;23:1355-1362.]  相似文献   
64.
Confidentiality is a promise rooted in tradition, law andmedical ethics. Emergency physicians treat a variety of patients to whom confidentiality is of vital importance: employees, celebrities, victims of violence or disaster, minors, students, criminals, drug abusers, and patients with STDs. EDs should develop methods of ensuring confidentiality for all patients.34Although confidentiality is an important principle thatshould be respected and guarded, it is not absolute. Various laws mandate disclosure of certain patient information; in addition, an overriding moral duty may occasionally require, a breach of confidentiality. As Beauchamp and Childress noted, “the therapeutic role may sometimes have to yield to ones role as citizen and as protector of the interests of others”.19 In general, however, circumstances requiring a breach of confidentiality are rare.  相似文献   
65.
Taking occlusal photographs can be challenging; they are by far the most difficult images to obtain. Achieving an ideal photograph of every arch may not always be possible. In patients with limited range of motion of the mandible, an oversized or hyperactive tongue, an excessive gag reflex, or reduced flexibility of lips and checks, the goal of an ideal occlusal photograph may not be achieved. Nevertheless, patience, practice, and attention to detail can often provide a satisfactory result.  相似文献   
66.
This report describes the outcomes of 28 children who had severe head injuries between 13–18 years of age. All were unconscious at least 24 hours and have been followed at least 2 years after injury. At present, their ages range from 18 to 27 years. Their educational achievements, social activities, marital status, functional independence, and employment at follow-up are described.  相似文献   
67.
Can nurses practice caring within a healthcare system that promotes codependency? Caring promotes mutual empowerment of all participants while codependent caring disempowers. Nurses are expected to practice caring with clients, The authors contend, however, that nursing, as historically and currently practiced within bureaucratic/patriarchal organizations, is founded on a vlue system that fosters codependency. Until nursing is practiced within the context of caring organizations and a caring healthcare system, nurses will continue to be powerless to shape their own practice as carers and burnout will continue to be a problem.  相似文献   
68.
Cutaneous metastasis of vaginal carcinoma is extremely rare. So far, the total number of reported skin metastasis of vaginal carcinoma is only one. We present another case with an unusual manifestation of vagina carcinoma metastasis: skin metastasis presenting as a leg ulcer on the lower leg.  相似文献   
69.
Hypertrophic scars (HS) are a consequence of abnormal wound healing. We examined fatty acids that are contained within, and participate in, every reaction through the membrane; then, we analyzed the percentage composition of the fatty acids in deepithelialized normal dermis (ND) and HS. In vivo HS samples were obtained from six patients undergoing surgical excision, and ND samples from five patients undergoing skin grafting surgery for excess. In vitro, cultured fibroblasts from HS and ND were also analyzed. The percentage composition of fatty acids extracted from all the samples was analyzed. In vivo, arachidonic acid (20:4) was significantly more abundant in HS than in ND, in the phospholipids from both whole tissue and cell membranes. In vitro, there were no significant differences among ND, HS, and 10% fetal calf serum. The results suggest that HS formation does not necessarily involve simple excess of 20:4; however, there are considerable differences in the percentage composition of 20:4 between ND and HS. Arachidonic acid probably participates in the formation and maintenance of HS, whereas in vitro cultured fibroblasts are affected largely by fetal calf serum.  相似文献   
70.
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