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   39343篇
  免费   5291篇
  国内免费   1013篇
耳鼻咽喉   225篇
儿科学   520篇
妇产科学   459篇
基础医学   2062篇
口腔科学   897篇
临床医学   8123篇
内科学   2708篇
皮肤病学   173篇
神经病学   1664篇
特种医学   551篇
外国民族医学   1篇
外科学   4596篇
综合类   5323篇
现状与发展   1篇
一般理论   23篇
预防医学   7737篇
眼科学   228篇
药学   4183篇
  86篇
中国医学   5057篇
肿瘤学   1030篇
  2024年   286篇
  2023年   1155篇
  2022年   1721篇
  2021年   2375篇
  2020年   2481篇
  2019年   2166篇
  2018年   1994篇
  2017年   2079篇
  2016年   1963篇
  2015年   1836篇
  2014年   2954篇
  2013年   3601篇
  2012年   2507篇
  2011年   2668篇
  2010年   2013篇
  2009年   1790篇
  2008年   1849篇
  2007年   1767篇
  2006年   1519篇
  2005年   1131篇
  2004年   951篇
  2003年   913篇
  2002年   625篇
  2001年   549篇
  2000年   513篇
  1999年   352篇
  1998年   326篇
  1997年   264篇
  1996年   232篇
  1995年   171篇
  1994年   132篇
  1993年   121篇
  1992年   101篇
  1991年   73篇
  1990年   85篇
  1989年   66篇
  1988年   48篇
  1987年   48篇
  1986年   28篇
  1985年   39篇
  1984年   24篇
  1983年   18篇
  1982年   20篇
  1981年   19篇
  1980年   21篇
  1979年   12篇
  1978年   9篇
  1977年   9篇
  1975年   5篇
  1974年   9篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
The rationale and methodology behind the Australian Quality Assurance Project is described. The Project aimed to develop guidelines for treatment content based on three sources of information: research findings, current practice and expert opinion. The issue of the gap between research and practice is discussed, as well as the role of dissemination in altering clinician behaviour.  相似文献   
72.
A concise overview of current knowledge on the aetiology ofcongenital heart disease is provided. At present, only 10 to20% of the cases occurring in neonates can be attributed toknown risk factors. Recurrence within relatives, chromosomalanomalies, genetic disorders, maternal diseases and teratogenexposure are addressed briefly; contemporary research modelsand methods, e.g. embryology and genetics and molecular biology,are referred to. A major innovation has been the introductionof the concept of common pathogenetic pathways. Thus, differentteratogenic factors or risk-factors may affect normal developmentat an identical stage and cause similar malformations. Also,the importance of timing of an event is stressed. If the timeframe of exposure does not coincide with embryogenesis any teratogeniceffect may be missed. Large-scale epidemiological studies on fetuses and neonateswith congenital heart disease are introduced as a third modeof research on the aetiology, although this approach is notused efficiently at present; cases of intra-uterine death canbe considered a valuable source of information that needs furtherattention. Combined, the above three lines of research may proveproductive, but the design of a comprehensive research projectwould need to be handled carefully. Possibilities for preventionof the occurrence of cardiovascular malformations are reported.Through lack of knowledge of causality, at present, only secondaryprevention may be possible and hence deserves attention. However,there appears to be no provision for thorough pre-natal screeningtests for congenital heart disease in an unselected population.  相似文献   
73.
  • ? A pilot study of catheterized women was designed to investigate their perceptions of pain and discomfort during the procedure.
  • ? The study aimed to test the feasibility of conducting a larger randomized controlled trial.
  • ? Problems were encountered during the execution of the study, due to the need to conform to established principles in clinical research.
  • ? Restrictions on access to patients impinged upon the opportunity to ‘cast the net wide’ in order to generate meaningful data.
  相似文献   
74.
75.
龚定国考     
经考证,著《内府秘传经验女科》的龚定国是明末名医龚廷贤之子。  相似文献   
76.
目的:研究补肾健脾法治疗胎怯的临床疗效。方法:以补肾健脾方药制成助长口服液为治疗组,以不用药为对照组,进行治疗胎怯的临床对照观察。结果:治疗组疗效(78%)显著优于对照组(52%),P<0.001;治疗组在改善体重、身长、头围、胸围、上臂围等方面显著优于对照组,P<0.05~0.01;治疗组治疗后血清T3升高,T4下降,与对照组相比,P<0.05;在降低患病率方面,治疗组(43%)优于对照组(72%),P<0.05;治疗组远期疗效优于对照组,P<0.05。结论:补肾健脾法治疗胎怯有显著的临床疗效。  相似文献   
77.
Interventions are needed to improve the quality of care for schizophrenia. However, in designing these interventions it would be helpful to understand better which patients are at highest risk for poor-quality care and why care for this disorder is often of poor quality. We study the extent to which patient and treatment factors are associated with poor-quality care in 224 patients randomly sampled from two mental health clinics. Quality of medication management is evaluated using an established method based on national treatment recommendations. Multivariate regression is used to study the effect of patient and treatment factors on treatment quality, controlling for provider. Risk for poor-quality care was greater for patients who were more severely ill, older, and less compliant with treatment recommendations. There were trends toward poor management of symptoms in men and substance abusers, and poor management of side effects in Black patients. Provision of poor-quality care was associated with failure to document symptoms and side effects in the medical record. Interventions to improve care for schizophrenia should attend to the need for accurate clinical assessment and strategies for managing challenging clinical situations.  相似文献   
78.
79.
80.
This article replicates for Kinsey's male sample the decade-of-birth analyses provided in the Kinsey female volume. Five generations of male respondents are compared in terms of total frequency of sexual activity, and frequency and incidence of nine specific categories of sexual behavior. In general, unmarried males born after 1900 experienced more frequent sexual outlet than did nineteenth-century males. Additionally, the proportion of total outlet devoted to various specific activities varied by birth decade. Solitary masturbation rose somewhat spectacularly in significance with the passing decades, while nocturnal emissions and animal contacts declined. Orgasms provided by heterosexual activities increased slightly for the early twentieth-century generations, but then declined to a point below their nineteenth-century levels. Although homosexual contacts accounted for a constant percentage of total outlet for unmarried males over the five generations, more males in each succeeding generation were actively engaging in homosexual activity, at least on a casual basis. Similarly, although heterosexual contacts accounted for a smaller percentage of all activity among the unmarried in later generations, more of the later-born males had engaged in such activity at least once. For married males, on the other hand, frequency of total outlet was unaffected by generation. A large and stable proportion of this outlet was provided by marital coitus. Although more males in later generations had experienced extramarital contacts, such activities accounted for a small and reasonably stable proportion of total outlet, when frequency of occurrence was considered. Masturbation gained in significance, while nocturnal emissions and homosexual contacts declined, and animal contacts among the married were almost nonexistent in all generations.  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