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   367510篇
  免费   23558篇
  国内免费   8071篇
耳鼻咽喉   4200篇
儿科学   9637篇
妇产科学   6589篇
基础医学   29023篇
口腔科学   9834篇
临床医学   39566篇
内科学   43724篇
皮肤病学   4584篇
神经病学   19680篇
特种医学   9606篇
外国民族医学   33篇
外科学   48226篇
综合类   55694篇
现状与发展   13篇
一般理论   29篇
预防医学   35841篇
眼科学   5521篇
药学   31702篇
  422篇
中国医学   31588篇
肿瘤学   13627篇
  2024年   1203篇
  2023年   5898篇
  2022年   10642篇
  2021年   14499篇
  2020年   13558篇
  2019年   18965篇
  2018年   16621篇
  2017年   13655篇
  2016年   11311篇
  2015年   10529篇
  2014年   21700篇
  2013年   23123篇
  2012年   19951篇
  2011年   21627篇
  2010年   17401篇
  2009年   16025篇
  2008年   15459篇
  2007年   15955篇
  2006年   13857篇
  2005年   12154篇
  2004年   9901篇
  2003年   8569篇
  2002年   6718篇
  2001年   6028篇
  2000年   4934篇
  1999年   4302篇
  1998年   3478篇
  1997年   3306篇
  1996年   2831篇
  1995年   2706篇
  1994年   2586篇
  1993年   2069篇
  1992年   2069篇
  1991年   1782篇
  1990年   1578篇
  1989年   1400篇
  1988年   1332篇
  1985年   3813篇
  1984年   4822篇
  1983年   3371篇
  1982年   3843篇
  1981年   3584篇
  1980年   3175篇
  1979年   2923篇
  1978年   2549篇
  1977年   1913篇
  1976年   2160篇
  1975年   1646篇
  1974年   1432篇
  1973年   1280篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
关节镜辅助下钢板内固定治疗关节内跟骨骨折   总被引:3,自引:1,他引:2  
[目的]探讨分析关节镜辅助下钢板内固定治疗关节内跟骨骨折的方法和疗效;[方法]对78位患者,86例累及关节面的跟骨骨折在关节镜辅助下行切开复位钢板内固定术,术后平均随访18个月(12~30个月),通过比较术前术后X线片和踝足功能的AOFAS评分对治疗效果作分析评价.[结果]86例关节内跟骨骨折术后X线示复位满意.与术前存在显著性差异(P〈0.01),AOFAS评分优良率91.86%.[结论]对于关节内跟骨骨折,采用关节镜辅助钢板内固定更加接近解剖复位,足部功能恢复满意且并发症少  相似文献   
52.
Introduction Recent reviews found problem gamblers are heterogeneous and recommended subtyping gamblers in treatment studies. Objective Review factors (stage of change, preferred gambling activity, co-occurring disorder, and temporal instability of symptoms) for subtyping by evaluating the evidence for their effects on gambling treatment. Methods Literature review, evidence grading. Results Evidence is limited that any of the reviewed factors affects gambling treatment. Substantial evidence from prospective studies and other evidence from cross-sectional studies and the strong placebo response among pathological gamblers support the temporal instability of gambling symptoms. Conclusions Multiple studies are needed to develop the evidence base needed to subtype gamblers in treatment. Changes in the diagnostic criteria of pathological gambling may be necessary, especially to specify the persistence of gambling-related symptoms.  相似文献   
53.
54.
Introduction The associations between vitamin D receptor (VDR) Bsm I and Fok I genotypes, parity, and risk of osteoporotic hip fracture were evaluated in a statewide population-based case-control study in Utah.Methods Women age 50–89 years with hip fracture (n=882) were ascertained via surveillance of 18 Utah hospitals from 1997 to 2001. Age-matched controls were randomly selected (n=897). Participants were interviewed in their homes, and blood samples were collected for genotyping.Results In logistic regression analyses that controlled for multiple confounders, Bsm I VDR genotype but not Fok I genotype was associated with risk of osteoporotic hip fracture (OR bb vs. BB genotype: 0.68; 95% CI: 0.50, 0.95). In similar analyses, no overall association was observed between parity status and risk of osteoporotic hip fracture. However, the effect of VDR genotype was modified by parity status. Among nulliparous women (n=140), Bsm I genotype was not associated with risk of hip fracture (OR bb vs. BB: 0.82; 95% CI: 0.28, 2.4); among primiparous women (n=133), bb genotype was associated with increased risk of hip fracture (OR bb vs. BB: 3.30; 95% CI: 0.96, 11.29); among multiparous women (n=1,400), bb genotype was associated with decreased risk of hip fracture (OR bb vs. BB: 0.59; 95% CI: 0.42, 0.84).Conclusion VDR Bsm I genotype was associated with risk of hip fracture in Utah women, and this effect was modified by parity status. Hormonal or lifestyle factors related to parity may underlie this interaction.  相似文献   
55.
We report the case of a 4-year-old girl who had quadricuspid aortic valve regurgitation with tetralogy of Fallot and pulmonary atresia. This combination is very uncommon. Aortic valve replacement was performed successfully due to aortic regurgitation which had progressed one year after the total repair. The dilated aortic annulus plus quadricuspid aortic valve may result in progressive aortic regurgitation for a short period.  相似文献   
56.
Consecutive patients (n = 215) who were referred to optometric (55%) or multidisciplinary (45%) low-vision services and above 50 years of age were recruited from four hospitals in the Netherlands. They completed two vision-related quality of life questionnaires, the Vision Quality of Life Core Measure (VCM1) and the Low Vision Quality of Life Questionnaire (LVQOL), before their first visit with low-vision services and 1 year later. At follow-up, patients referred to multidisciplinary low-vision services had lower scores on the mobility subscale of the LVQOL than patients referred to optometric low-vision services [5.3 points; 95% confidence interval (CI): 0.2-10.5]. Paired sample t-tests for the two groups of patients taken together show improvement for the VCM1 (3.1 points; 95% CI: 0.6-5.6) and deterioration for the basic aspects of vision (3.5 points; 95% CI: 1.1-5.9) and the mobility (6.6 points; 95% CI: 3.7-9.5) subscales of the LVQOL. In conclusion, people referred to optometric services showed less deterioration in mobility than those referred to multidisciplinary services. No differences were observed for any of the other subscales of the LVQOL and the VCM1. Future research in this field should include randomized controlled designs comparing low-vision services with no treatment or placebo.  相似文献   
57.
慢性肺心病哮喘持续状态218例临床分析   总被引:1,自引:0,他引:1  
朱盈援 《重庆医学》2006,35(18):1668-1670
目的探索治疗慢性肺心病哮喘持续状态的方法。方法回顾性分析1983年10月~2005年3月收治的218例慢性肺心病哮喘持续状态患者的临床资料。结果哮喘持续状态在48h以内被控制的62例(28.4%);在72h以内控制的56例(25.7%);在120h以内控制的25例(11.5%);在168h以内控制的34例(15.6%);痊愈出院177例(81.2%);死亡41例(18.8%)。结论(1)治疗慢性肺心病哮喘持续状态.根据患者的病理变化.综合治疗.效果显著。(2)在治疗过程中.要恰当选择抗生素和平喘药;对那些血液黏滞度增高的患者.要加用血液稀释疗法。(3)测定血液黏滞度和氧饱和度.可以指导治疗、估计预后.应当列为常规检查。  相似文献   
58.
目的研究医院门诊人数增长与门诊医疗质量因子的关系,找出影响门诊人数增长的主要门诊医疗质量因子。方法利用秩和比法对实例进行分析。结果影响门诊人数增长的门诊质量因子,首先是高中级职称比(χ2=32.43,P<0.05),其次是副高以上职称的坐诊工时比(χ2=31.91,P<0.05),再次是新技术项目或重大改革(χ2=28.54,P>0.05)。结论研究医院门诊人数增长与门诊医疗质量因子的关系时,秩和比法有应用推广的价值。  相似文献   
59.
粉防己碱对野百合碱致大鼠肺动脉构形重建的逆转作用   总被引:2,自引:0,他引:2  
以野百合碱复制Wistar大鼠肺动脉高压模型,用特殊染色方法观察粉防已碱对野百合碱致大鼠肺动脉构形重建的逆转作用,结果表明粉防已碱可选择性的降低野百合碱诱导的大鼠肺动脉高压的作用,并明显地逆转肺血管及肺组织损伤,降低肺动脉高压和右心室肥大,对体循环压力无影响  相似文献   
60.
超市连锁店熟食卤味销售的HACCP研究   总被引:2,自引:0,他引:2  
应用HACCP的原理和方法,对超市连锁店熟食卤味销售进行了危害因素分析,找出了关键控制点(CCP),提出了控制措施,并建议超市连锁店销售非包装熟食卤味时使用密封低温冷藏展示柜。  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