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   1711989篇
  免费   124722篇
  国内免费   3929篇
耳鼻咽喉   22036篇
儿科学   55916篇
妇产科学   46466篇
基础医学   243454篇
口腔科学   49173篇
临床医学   152892篇
内科学   336859篇
皮肤病学   39092篇
神经病学   132233篇
特种医学   64770篇
外国民族医学   242篇
外科学   259347篇
综合类   39486篇
现状与发展   5篇
一般理论   543篇
预防医学   125082篇
眼科学   40730篇
药学   125003篇
  7篇
中国医学   4624篇
肿瘤学   102680篇
  2021年   13470篇
  2019年   13977篇
  2018年   20527篇
  2017年   15627篇
  2016年   17142篇
  2015年   19668篇
  2014年   27076篇
  2013年   38846篇
  2012年   54182篇
  2011年   56823篇
  2010年   33576篇
  2009年   31412篇
  2008年   52476篇
  2007年   55721篇
  2006年   56133篇
  2005年   53404篇
  2004年   51408篇
  2003年   48690篇
  2002年   46826篇
  2001年   92007篇
  2000年   93813篇
  1999年   77161篇
  1998年   19816篇
  1997年   17342篇
  1996年   17443篇
  1995年   16805篇
  1994年   15349篇
  1993年   14109篇
  1992年   57473篇
  1991年   55367篇
  1990年   53050篇
  1989年   50821篇
  1988年   46201篇
  1987年   45027篇
  1986年   42292篇
  1985年   40046篇
  1984年   29395篇
  1983年   24953篇
  1982年   13921篇
  1979年   25567篇
  1978年   17599篇
  1977年   14929篇
  1976年   13894篇
  1975年   14586篇
  1974年   17651篇
  1973年   16975篇
  1972年   15702篇
  1971年   14480篇
  1970年   13462篇
  1969年   12545篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
141.
142.
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   
143.
144.
145.
146.
147.
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   
148.
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   
149.
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   
150.
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