全文获取类型
收费全文 | 1450900篇 |
免费 | 116510篇 |
国内免费 | 3393篇 |
专业分类
耳鼻咽喉 | 18738篇 |
儿科学 | 47952篇 |
妇产科学 | 42327篇 |
基础医学 | 205847篇 |
口腔科学 | 38179篇 |
临床医学 | 131884篇 |
内科学 | 291265篇 |
皮肤病学 | 33908篇 |
神经病学 | 121095篇 |
特种医学 | 54492篇 |
外国民族医学 | 468篇 |
外科学 | 214098篇 |
综合类 | 33265篇 |
现状与发展 | 3篇 |
一般理论 | 557篇 |
预防医学 | 115815篇 |
眼科学 | 32075篇 |
药学 | 101125篇 |
1篇 | |
中国医学 | 3376篇 |
肿瘤学 | 84333篇 |
出版年
2021年 | 12144篇 |
2019年 | 12940篇 |
2018年 | 17959篇 |
2017年 | 13706篇 |
2016年 | 15420篇 |
2015年 | 17195篇 |
2014年 | 24173篇 |
2013年 | 35709篇 |
2012年 | 48704篇 |
2011年 | 51458篇 |
2010年 | 30036篇 |
2009年 | 28643篇 |
2008年 | 47209篇 |
2007年 | 49719篇 |
2006年 | 50087篇 |
2005年 | 48492篇 |
2004年 | 45955篇 |
2003年 | 43623篇 |
2002年 | 42102篇 |
2001年 | 73252篇 |
2000年 | 74744篇 |
1999年 | 61793篇 |
1998年 | 17340篇 |
1997年 | 15688篇 |
1996年 | 15777篇 |
1995年 | 14971篇 |
1994年 | 13557篇 |
1993年 | 12713篇 |
1992年 | 45920篇 |
1991年 | 43539篇 |
1990年 | 41556篇 |
1989年 | 39607篇 |
1988年 | 36227篇 |
1987年 | 35395篇 |
1986年 | 32901篇 |
1985年 | 31303篇 |
1984年 | 23852篇 |
1983年 | 20052篇 |
1982年 | 12235篇 |
1981年 | 10804篇 |
1979年 | 20712篇 |
1978年 | 14590篇 |
1977年 | 12094篇 |
1976年 | 11372篇 |
1975年 | 11628篇 |
1974年 | 13997篇 |
1973年 | 13541篇 |
1972年 | 12641篇 |
1971年 | 11476篇 |
1970年 | 10915篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Analysis of accident logs in child day care centers indicates that biting is common, especially among toddlers 13 to 30 months of age. Children of this age often lack appropriate verbal skills and resort to aggressive means to achieve their goals. Still awkward in gross-motor skills, toddlers can also suffer self-bites following accidental falls. According to medical reports, human bites sometimes are more virulent than animal bites and can cause severe trauma. Although the AIDS virus has been cultured from saliva, transmission from saliva alone has not been documented. Bite injuries in day care, however, usually are minor and can be treated by washing, applying cold compresses, and comforting the child. Suggested methods to diminish the frequency of biting in day care include physical changes within the room, behavior modification, and other classroom management techniques. 相似文献
102.
G C Conoscenti S Alberico P Bogatti A Maieron L Fischer Tamaro C Gigli 《Minerva ginecologica》1991,43(12):549-553
The Authors examine the correlation between hypertensive disorders of pregnancy and fetal growth. The results of a study of 342 pregnancies, confirm a significant correlation between hypertension and fetal growth retardation. These findings, so evident in moderate and severe hypertension, have also been confirmed in cases of mild hypertension. The medical treatment also in the pregnancies with mild hypertension, and a larger utilisation of operative deliveries, determined a decrease in perinatal mortality and morbidity. 相似文献
103.
C K Fischer 《The Journal of reproductive medicine》1991,36(1):74-76
Fifteen cases of microtuboplasty were done as outpatient procedures at low cost and with increased patient convenience. Advances in outpatient surgery at free-standing surgery centers have allowed many new patient care innovations, and microsurgery should now be considered an outpatient procedure for gynecologic patients. Outpatient microtuboplastic surgery is not only feasible but perhaps preferable to that done as an inpatient procedure. 相似文献
104.
105.
D.-Y. LIN I.-S. SHEEN C.-M. CHU & Y.-F. LIAW 《Alimentary pharmacology & therapeutics》1996,10(6):961-966
Background : The clinical course of chronic hepatitis B is variable. Patients with hepatic decompensation, bridging necrosis or an alpha-fetoprotein level greater than 100 ng/mL during an exacerbation of hepatitis have a high risk of developing cirrhosis. This study was conducted to evaluate the effect of colchicine in the prevention of cirrhosis in such patients.
Methods : Patients with risk factor(s) were randomized to receive either colchicine 5 mg/week or no specific treatment, the end point being development of cirrhosis.
Results : After a follow up period of 4 years, the treatment group had a marked reduction in exacerbations of acute hepatitis (32% vs. 63%/patient/year, P <0.005). Seven out of 38 patients in the treatment group and 10 out of 27 patients in the control group developed cirrhosis. The calculated cumulative incidence of cirrhosis by the end of first, second, third and fourth years in the treatment group was 8.7, 18.6, 32 and 32%, respectively. The corresponding figures in the control group were 30, 35.5, 46.3 and 73.2%, respectively, with a P -value of 0.057.
Conclusions : The results suggest that colchicine may prevent cirrhosis in chronic hepatitis B patients with risk factor(s), possibly by suppressing exacerbations of hepatitis through an anti-inflammatory effect. 相似文献
Methods : Patients with risk factor(s) were randomized to receive either colchicine 5 mg/week or no specific treatment, the end point being development of cirrhosis.
Results : After a follow up period of 4 years, the treatment group had a marked reduction in exacerbations of acute hepatitis (32% vs. 63%/patient/year, P <0.005). Seven out of 38 patients in the treatment group and 10 out of 27 patients in the control group developed cirrhosis. The calculated cumulative incidence of cirrhosis by the end of first, second, third and fourth years in the treatment group was 8.7, 18.6, 32 and 32%, respectively. The corresponding figures in the control group were 30, 35.5, 46.3 and 73.2%, respectively, with a P -value of 0.057.
Conclusions : The results suggest that colchicine may prevent cirrhosis in chronic hepatitis B patients with risk factor(s), possibly by suppressing exacerbations of hepatitis through an anti-inflammatory effect. 相似文献
106.
107.
108.
109.
Birth weight on 12,644 singleton infants from 6,196 sibships born in Maryland between 1980 and 1984 were used to estimate the effects of nine maternal and infant covariates on the sibship correlation in birth weight. Assuming a homogeneous correlation across all families, the estimated intraclass correlation was 0.4664 (+/- 0.0099). This high sibship correlation makes it possible to predict, with reasonable accuracy, the birth weight of a child given information on previous sibs, as well as covariates on the mother and/or infant pertinent to a given pregnancy. The reduction in variance associated with incorporating information on the nine covariates used here was approximately equal to that obtained by conditioning on a single previous sib. Testing for heterogeneity in correlation among different groups of families showed that a crude measure of parity (first live birth vs. other), time between births, mother's marital status, and maternal age at the birth of the last child significantly influenced the sibship correlation in birth weight. 相似文献
110.