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   139348篇
  免费   12423篇
  国内免费   6804篇
耳鼻咽喉   1669篇
儿科学   2147篇
妇产科学   1962篇
基础医学   16249篇
口腔科学   2473篇
临床医学   16889篇
内科学   21049篇
皮肤病学   3017篇
神经病学   6911篇
特种医学   5715篇
外国民族医学   43篇
外科学   13718篇
综合类   20203篇
现状与发展   28篇
一般理论   18篇
预防医学   10408篇
眼科学   3125篇
药学   15283篇
  118篇
中国医学   7423篇
肿瘤学   10127篇
  2024年   306篇
  2023年   1608篇
  2022年   3940篇
  2021年   6224篇
  2020年   4475篇
  2019年   4123篇
  2018年   4416篇
  2017年   4159篇
  2016年   4198篇
  2015年   6392篇
  2014年   8029篇
  2013年   8464篇
  2012年   12153篇
  2011年   12606篇
  2010年   8621篇
  2009年   7062篇
  2008年   8784篇
  2007年   8306篇
  2006年   7899篇
  2005年   7103篇
  2004年   5191篇
  2003年   4608篇
  2002年   3894篇
  2001年   2790篇
  2000年   2503篇
  1999年   2038篇
  1998年   1086篇
  1997年   1026篇
  1996年   767篇
  1995年   722篇
  1994年   638篇
  1993年   435篇
  1992年   636篇
  1991年   592篇
  1990年   458篇
  1989年   344篇
  1988年   340篇
  1987年   274篇
  1986年   229篇
  1985年   194篇
  1984年   139篇
  1983年   95篇
  1982年   68篇
  1981年   69篇
  1980年   53篇
  1979年   76篇
  1978年   48篇
  1977年   40篇
  1974年   39篇
  1973年   40篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
The aim of the study was to explore the relationship between college graduates’ dual self-consciousness, job search clarity and perceived stress, and reveal the mediating role of perceived stress between dual self-consciousness and job search clarity. In this study, 467 college graduates were investigated using the Dual Self-Consciousness Scale, Job Search Clarity Scale, and Perceived Stress Scale. After controlling for gender, age, and region, the results revealed that: (1) private self-consciousness has a significant positive predictive effect on job search clarity; (2) perceived stress has a significant negative predictive effect on job search clarity; (3) perceived stress plays partial mediation effects between private self-consciousness and job search clarity; (4) perceived stress plays complete mediation effects between public self-consciousness and job search clarity; (5) perceived stress has suppressing effects between public self-consciousness and job search clarity.  相似文献   
85.
86.
Background. It has been reported that gender differences in cardiovascular outcomes found in adults also are present in children who undergo surgical repair for congenital heart disease. Methods. California statewide hospital discharge data 1989–99 were used to study outcomes in children <18 years undergoing cardiac surgery. Hospital discharge data were linked to death registry data to study postdischarge death within 30 days of discharge. We used logistic regression to evaluate the effect of gender on mortality controlling for age, race and ethnicity, type of insurance, household income, date and month of surgery, type of admission, hospital case volume, and various types of procedures. Results. There were 25 402 cardiac surgery cases with 1505 in‐hospital deaths (mortality rate of 5.92%). An additional 37 deaths occurred within 30 days after hospital discharge. Crude mortality rates for males (5.99%) and females (5.84%) were not significantly different. However, fewer neonates were female and females underwent a higher proportion of low‐risk procedures than males. Logistic regression revealed that females, compared with males, had a significantly higher odds ratio (OR) for in‐hospital mortality (OR = 1.18, P < .01) and overall (up to 30 days post discharge) mortality (OR = 1.18, P < .01). The risk‐adjusted length of hospital stay was similar between females and males while charges per hospital day were slightly higher in females than males. The prevalence of Down syndrome, pulmonary hypertension, and failure to thrive were higher in females. Conclusions. Female gender is associated with an 18% higher in‐hospital and 30‐day postdischarge mortality as compared with male gender. There was no difference in length of hospital stay between males and females. The mechanism by which female gender acts as a risk factor requires further investigation.  相似文献   
87.
88.
89.
目的探讨下颌骨缺损即刻植骨修复术后,伤口延期愈合的影响因素。方法将下颌骨即刻植骨分为Ⅰ期愈合组和延期愈合组,回顾性地查阅住院病历,按预先设计的表格填写有关项目。结果下颌骨即刻植骨的愈合与患者的年龄、受骨区是否有手术史、植骨的类型、植骨的大小无关;术中口内外相通是植骨延期愈合的主要因素。结论下颌骨良性病变即刻植骨修复时,应密切关注术区与口内外穿通情况,进行有针对性地处理,争取植骨Ⅰ期愈合。  相似文献   
90.
皮质发育障碍模型的建立及其致痫敏感性的研究   总被引:1,自引:0,他引:1  
目的:建立皮质发育障碍模型,探讨皮质发育障碍模型的敏感性。方法:在SD大鼠孕17d腹腔注入1,3-二氯乙烯-亚硝基脲(BCNU)制作皮质发育障碍模型;Nissl染色观察P60d仔鼠病理变化;选取P60d雄性仔鼠,腹腔注射氯化锂-毛果芸香碱,分别比较两组大鼠癫发生的潜伏期、持续状态时间和死亡率。结果:同龄仔鼠脑组织湿重实验组比对照组显著减轻(P<0.01);Nissl染色显示皮质变薄、皮质层次紊乱、海马区域异位细胞异常聚集;有皮质发育障碍的仔鼠注射氯化锂-毛果芸香碱后,癫发生的潜伏期显著缩短(P<0.01),癫持续状态时间延长(P<0.01),死亡率显著升高(P<0.05)。结论:BCNU致皮质发育障碍模型具有癫易感性。  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