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   340295篇
  免费   75005篇
  国内免费   10933篇
耳鼻咽喉   6794篇
儿科学   10436篇
妇产科学   4214篇
基础医学   30790篇
口腔科学   8454篇
临床医学   52106篇
内科学   82535篇
皮肤病学   15016篇
神经病学   30951篇
特种医学   12972篇
外国民族医学   74篇
外科学   65239篇
综合类   24485篇
现状与发展   103篇
一般理论   27篇
预防医学   20333篇
眼科学   7355篇
药学   19425篇
  127篇
中国医学   8784篇
肿瘤学   26013篇
  2024年   1049篇
  2023年   6309篇
  2022年   5408篇
  2021年   9645篇
  2020年   14981篇
  2019年   16186篇
  2018年   19071篇
  2017年   20278篇
  2016年   21548篇
  2015年   23439篇
  2014年   31661篇
  2013年   32299篇
  2012年   18339篇
  2011年   19339篇
  2010年   25205篇
  2009年   24519篇
  2008年   14842篇
  2007年   12143篇
  2006年   14356篇
  2005年   10820篇
  2004年   8677篇
  2003年   7991篇
  2002年   7293篇
  2001年   7949篇
  2000年   6460篇
  1999年   5677篇
  1998年   5034篇
  1997年   4795篇
  1996年   4354篇
  1995年   4090篇
  1994年   2717篇
  1993年   2032篇
  1992年   1913篇
  1991年   1884篇
  1990年   1472篇
  1989年   1528篇
  1988年   1349篇
  1987年   1132篇
  1986年   1138篇
  1985年   907篇
  1984年   680篇
  1983年   619篇
  1982年   575篇
  1981年   457篇
  1980年   398篇
  1979年   407篇
  1978年   369篇
  1977年   423篇
  1975年   317篇
  1972年   327篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
目的通过研究肺表面活性物质(PS)结合持续气道正压通气(CPAP)治疗新生儿呼吸窘迫综合征(NRDS)的治疗效果,进一步指导NRDS的临床治疗。方法选取于2017年4月-2018年10月间在本院收治的80例确诊为新生儿呼吸窘迫综合征的患儿作为研究对象,随机将患儿分为试验组和对照组,对照组给予持续气道正压通气治疗,试验组在对照组的基础上联合使用PS治疗。结果试验组对于呼吸窘迫缓解的有效率明显高于对照组,在气管插管内滴入PS治疗后试验组的血气情况明显优于对照组,且试验组患儿副作用发生率明显低于对照组,以上指标差异具有统计学意义,P <0.05。结论 PS结合CPAP在新生儿呼吸窘迫综合征的治疗中疗效很好。  相似文献   
13.
14.
通过文献研究、问卷调查、专家访谈、现地调研等方法,分析医院离退休干部参与社会治理的现状及影响因素,探讨社区对离退休干部参与社会治理的需求,提出通过党建引领医院离退休干部参与社会治理的“1235”模式,并给出具体的操作路径,以期为推动医院离退休干部积极参与社会治理提供参考。  相似文献   
15.
Laparoscopic surgery has several advantages over traditional surgery because it has been shown to be less invasive. The next logical step in the evolution of minimally invasive surgery may be to eliminate all abdominal incisions. The natural orifices provide a port of entry via the gastrointestinal tract to the peritoneal cavity. This approach would require the creation of a perforation, which is considered to be a major complication of endoscopy with significant morbidity and mortality. However, there are several recent studies that have described the technical feasibility and safety of a per‐oral transgastric approach to the peritoneal cavity using conventional endoscopes. Theoretically, this approach could reduce postoperative abdominal wall pain, wound infection, hernia formation, and adhesions. This article aims to summarize the current status of transgastric surgery, currently referred to as natural orifice transluminal endoscopic surgery (NOTES), and to address some of its future challenges.  相似文献   
16.
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   
17.
We report the case of a littoral‐cell angioma of the spleen, a recently described benign vascular tumour, whose imaging and pathological characteristics have been discussed only by a few authors. The diagnosis was made after elective splenectomy. The CT images, scintigraphy and histological specimens are presented, and differential diagnoses discussed.  相似文献   
18.
19.
20.
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