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   2445178篇
  免费   200066篇
  国内免费   4432篇
耳鼻咽喉   35123篇
儿科学   74601篇
妇产科学   64696篇
基础医学   343724篇
口腔科学   69206篇
临床医学   222535篇
内科学   483585篇
皮肤病学   48782篇
神经病学   207066篇
特种医学   98361篇
外国民族医学   889篇
外科学   371418篇
综合类   57329篇
现状与发展   2篇
一般理论   1037篇
预防医学   196576篇
眼科学   57397篇
药学   181830篇
  4篇
中国医学   4481篇
肿瘤学   131034篇
  2018年   25536篇
  2017年   19726篇
  2016年   21628篇
  2015年   24564篇
  2014年   35342篇
  2013年   53899篇
  2012年   72949篇
  2011年   76668篇
  2010年   45058篇
  2009年   43166篇
  2008年   73020篇
  2007年   77889篇
  2006年   78519篇
  2005年   76762篇
  2004年   73924篇
  2003年   71314篇
  2002年   70554篇
  2001年   112990篇
  2000年   116935篇
  1999年   98860篇
  1998年   28720篇
  1997年   26304篇
  1996年   26085篇
  1995年   25283篇
  1994年   23740篇
  1993年   22063篇
  1992年   79792篇
  1991年   76789篇
  1990年   73888篇
  1989年   71195篇
  1988年   66190篇
  1987年   65134篇
  1986年   61671篇
  1985年   58779篇
  1984年   44740篇
  1983年   38226篇
  1982年   23613篇
  1981年   21017篇
  1980年   19707篇
  1979年   41657篇
  1978年   29411篇
  1977年   24802篇
  1976年   23215篇
  1975年   24300篇
  1974年   29907篇
  1973年   28305篇
  1972年   26426篇
  1971年   24295篇
  1970年   22896篇
  1969年   21175篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Artificial dopamine agonists are widely employed for the treatment of idiopathic parkinsonism. Pleuropulmonary disease has previously been reported to occur with the use of bromocriptine and mesulergine. We report similar adverse effects induced by the newer agonists lisuride and cabergoline. All these agents are tetracyclic ergot derivatives. This suggests a causal link between ergot-derived dopamine agonists and pleuropulmonary disease.  相似文献   
952.
Reports on individual nonbehavioral child and adolescent psychotherapy since 1963 are reviewed. Inclusion criteria required some minimal contrasting group. Forty-three studies were assessed for basic methodological adequacy and main findings. The authors conclude that summary impressions from this body of literature cannot be made due to the magnitude of the flaws in basic psychotherapy research methodology. Suggestions are made regarding the future of child and adolescent psychotherapy research.  相似文献   
953.
954.
955.
Computer tomography (CT) of the brain is of value for finding potentially correctable lesions in adult patients with new onset seizures. The value of CT is unknown, however, for finding such lesions in adult chronic epileptic patients without prior CT. We compared a group of 177 adult patients who had CT within a year from the onset of seizures to a group of 93 patients who had a history of seizures for more than a year before CT was performed. In the first group, 33 potentially correctable lesions (19%) were found including 17 tumors. The group with chronic epilepsy had 4 (4%) potentially correctable lesions: 3 arteriovenous malformations and 1 meningioma. It seems that CT is of value in discovering potentially removable lesions in chronic epileptic patients, but the likelihood is relatively small. The incidence of stable structural lesions seems to be similar in the two groups.  相似文献   
956.
Forty-two therapists conducting individual psychotherapy with schizophrenic outpatients in a public mental health system responded to a questionnaire that focused on the types of interventions used and the issues and problems encountered in therapy. The therapists spent 59 percent of their time in supportive, problem-solving work and only 32 percent in traditional psychotherapeutic interventions, such as providing insight. The most common issues in therapy were relationship problems, family concerns, depression, losses, and the role of medications in the client's life. The most significant impediments to therapeutic work were the lack of community resources, the client's noncompliance with medications and lack of motivation, and dual diagnoses. Suggestions are offered for improving psychotherapy with schizophrenic outpatients in the public mental health system.  相似文献   
957.
958.
959.
BACKGROUND. Studies have documented the potential contributions of preventive health care programs. Yet little is known about which screening tests should be included in public health programs for older persons. This study offers recommendations regarding these tests. METHODS. The recommendations come from synthesizing the findings of the US Preventive Services Task Force, the literature, and the consensus of experts in geriatrics, gerontology, and health policy research. The literature was evaluated to identify methodologically sound studies of the prevalence of selected disorders and benefits and availability of screening procedures for those disorders. Experts from various fields specializing in the care of the elderly formed panels to assist in evaluating the literature and providing further information from gerontological and public health perspectives. RESULTS. We recommend vision testing for refractive error; inspection of the skin surface for fungal infection and skin cancer, drug eruptions, and xerosis; a history for symptoms of xerosis; audiometric testing for presbycusis; surveys for hearing loss; otoscopic inspection for cerumen impaction; dental examination for caries; measurement of blood pressure for hypertension; and breast examination and mammography for cancer. CONCLUSIONS. Our study suggests that these screening procedures are useful for public health screening programs. More information is needed on the effects of screening services on the health and functioning of older persons.  相似文献   
960.
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