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   1703578篇
  免费   124329篇
  国内免费   3798篇
耳鼻咽喉   21832篇
儿科学   55840篇
妇产科学   46262篇
基础医学   242195篇
口腔科学   48958篇
临床医学   152225篇
内科学   334909篇
皮肤病学   38737篇
神经病学   131902篇
特种医学   64175篇
外国民族医学   242篇
外科学   258712篇
综合类   39056篇
现状与发展   4篇
一般理论   536篇
预防医学   125090篇
眼科学   40328篇
药学   124361篇
  7篇
中国医学   4481篇
肿瘤学   101853篇
  2021年   12997篇
  2019年   13719篇
  2018年   20186篇
  2017年   15401篇
  2016年   16807篇
  2015年   19192篇
  2014年   26523篇
  2013年   38376篇
  2012年   53403篇
  2011年   56026篇
  2010年   33116篇
  2009年   30973篇
  2008年   51986篇
  2007年   55292篇
  2006年   55695篇
  2005年   53015篇
  2004年   51183篇
  2003年   48593篇
  2002年   46715篇
  2001年   91872篇
  2000年   93691篇
  1999年   77055篇
  1998年   19790篇
  1997年   17324篇
  1996年   17441篇
  1995年   16785篇
  1994年   15331篇
  1993年   14119篇
  1992年   57432篇
  1991年   55315篇
  1990年   53025篇
  1989年   50797篇
  1988年   46181篇
  1987年   44980篇
  1986年   42270篇
  1985年   40021篇
  1984年   29403篇
  1983年   24952篇
  1982年   13940篇
  1979年   25572篇
  1978年   17625篇
  1977年   14943篇
  1976年   13922篇
  1975年   14590篇
  1974年   17677篇
  1973年   16990篇
  1972年   15699篇
  1971年   14477篇
  1970年   13453篇
  1969年   12539篇
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
101.
102.
A rapid procedure for determining angiotensin II in the blood by inverse voltammetry using a TA-2 device (Tekhnoanalit Company, Tomsk) with a graphite electrode has been developed. The results of analyses using the proposed technique agree with the clinical data. The rapid analytical procedure favors optimization of cardiotropic drug therapy. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 12, pp. 54–56, December, 2006.  相似文献   
103.
104.
105.
106.
107.
OBJECTIVES: Pseudotumour cerebri has been previously recognized as a neurological side effect of combined oral contraceptives but has not been diagnosed with a delay of 3 years after initiation of combined oral contraceptives. CASE REPORT: A 19-year-old obese woman developed visual impairment and headache, 4 months after starting combined oral contraceptives. Three years later symptoms deteriorated and she presented with prominent tendon-jerks and congested optical-discs. Normal CSF drained with high pressure from the spinal tap. Pseudotumour cerebri was diagnosed. Headache and visual impairment resolved within 3 weeks after discontinuation of combined oral contraceptives. CONCLUSIONS: Combined oral contraceptives-induced pseudotumour cerebri may remain undetected for years. Young, obese women with visual impairment and headache under combined oral contraceptives should undergo immediate neurological and ophthalmological investigation.  相似文献   
108.
In order to assess the state and pathology of the woman's pelvis minor, a number of methods are commonly used among practitioners, encompassing clinical exploration, radiology, MRN, urodynamics, endoscopy and echography.

Echography has been poorly used in clinical pelvic exploration and its reliability is actually a matter of controversy 1. However, echographic surveys can provide us with valuable gynecological data on the state and pathologies of the soft pelvis, within the genital regions or even going beyond them, i.e. the rectal channel, bladder, urethra, anus, vascular plexuses, and all of their supporting tissues.

At our research unit, we have been employing Transvaginal Ultrasound echography (TVU) for a long time in conjunction with other pelvis-focused methods in order to study different kinds of pelvic alterations. TVU has proven to be friendly to use, fast, harmless and inexpensive, allowing serial explorations and producing high-quality dynamic images (loop-cinema, video-tape). Furthermore, this method is fairly aseptic in that the occurrence of faeces in the rectal ampolla is not a nuisance but a bonus in tracking the contours of the rectum walls and other topographical features which would be otherwise difficult to survey.

A complete pelvic floor TVU may add no longer than 5-8 minutes to a routine gynecological examination, can be implemented by the general gynecologist and generates data that can be further studied by the appropriate specialist for a more insightful evaluation 2.  相似文献   
109.
A 41-year-old Chinese lady had a Gr?fenberg ring in utero for 15 years. During that period of time, she had one normal vaginal delivery a year after insertion, followed by an ectopic pregnancy 12 years later. We discuss the possible mechanism of action of the Gr?fenberg ring and sequelae of its prolonged presence in the uterus.  相似文献   
110.
Postpartum fatigue is a normal condition that most women experience. Breastfeeding is often associated in women's minds as contributing to the feeling of overall perceived fatigue, and many women indicate that they have ceased breastfeeding because of fatigue. However, the relationship between feeding choice and perceived fatigue has never been established. Two hundred and fifty-three women participated in a study examining whether perceived fatigue differed for bottle-feeding and breastfeeding women at 3 different times during the postpartum period (2-4 days, 6 weeks, and 12 weeks postpartum). Results showed no significant differences for these 2 groups, suggesting that perceived fatigue during the postpartum period is not dependent on feeding choice. Additional analyses examining other variables with a potential effect were nonsignificant. Because perceived physical fatigue does not appear to be dependent on feeding choice, women should be prepared for the feeling of perceived fatigue during the postpartum period while at the same time be reassured that feeding choice is not correlated.  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