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   1557265篇
  免费   103360篇
  国内免费   4371篇
耳鼻咽喉   18495篇
儿科学   51819篇
妇产科学   40601篇
基础医学   221804篇
口腔科学   37884篇
临床医学   147011篇
内科学   297421篇
皮肤病学   27912篇
神经病学   131904篇
特种医学   58235篇
外国民族医学   366篇
外科学   220028篇
综合类   31800篇
现状与发展   1篇
一般理论   536篇
预防医学   137101篇
眼科学   32418篇
药学   111198篇
  6篇
中国医学   3832篇
肿瘤学   94624篇
  2021年   12209篇
  2019年   12940篇
  2018年   39432篇
  2017年   30763篇
  2016年   34871篇
  2015年   17328篇
  2014年   23228篇
  2013年   34982篇
  2012年   54181篇
  2011年   70917篇
  2010年   47149篇
  2009年   38130篇
  2008年   65715篇
  2007年   71443篇
  2006年   48016篇
  2005年   48400篇
  2004年   47713篇
  2003年   47030篇
  2002年   43489篇
  2001年   61463篇
  2000年   63349篇
  1999年   52720篇
  1998年   15077篇
  1997年   13801篇
  1996年   13417篇
  1995年   12769篇
  1994年   11921篇
  1993年   11155篇
  1992年   41762篇
  1991年   40971篇
  1990年   39676篇
  1989年   37541篇
  1988年   34748篇
  1987年   33861篇
  1986年   32293篇
  1985年   30782篇
  1984年   23153篇
  1983年   19702篇
  1982年   11858篇
  1979年   20918篇
  1978年   14902篇
  1977年   12097篇
  1976年   11957篇
  1975年   12137篇
  1974年   14842篇
  1973年   14504篇
  1972年   13366篇
  1971年   12428篇
  1970年   11530篇
  1969年   10461篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
The value of adding simeprevir (SMV) vs placebo (PBO) to peginterferon and ribavirin (PR) for treatment of chronic hepatitis C virus infection was examined using patient‐reported outcomes (PROs); further, concordance of PROs with virology endpoints and adverse events (AEs) was explored. Patients (= 768 SMV/PR,= 393 PBO/PR) rated fatigue (FSS), depressive symptoms (CES‐D) and functional impairment (WPAI: Hepatitis C Productivity, Daily Activity and Absenteeism) at baseline and throughout treatment in three randomised, double‐blind trials comparing the addition of SMV or PBO during initial 12 weeks of PR. PR was administered for 48 weeks (PBO group) and 24/48 weeks (SMV group) using a response‐guided therapy (RGT) approach. Mean PRO scores (except Absenteeism) worsened from baseline to Week 4 to the same extent in both groups but reverted after Week 24 for SMV/PR and only after Week 48 for PBO/PR. Accordingly, there was a significantly lower area under the curve (baseline–Week 60, AUC60) and fewer weeks with clinically important worsening of scores in the SMV/PR group at any time point. Incidences of patients with fatigue and anaemia AEs were similar in both groups, but FSS scores showed that clinically important increases in fatigue lasted a mean of 6.9 weeks longer with PBO/PR (P < 0.001). PRO score subgroup analysis indicated better outcomes for patients who met the criteria for RGT or achieved sustained virological response 12 weeks post‐treatment (SVR12); differences in mean PRO scores associated with fibrosis level were only observed with PBO/PR. Greater efficacy of SMV/PR enabled reduced treatment duration and reduced time with PR‐related AEs without adding to AE severity.  相似文献   
62.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
63.
64.
65.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
66.
67.
68.
In the 6th Basic Plan for Long-Term Electricity Supply and Demand (6th BPE) for Korea, for the first time, the environmental costs of air pollution caused by oxides of sulfur (SOx), oxides of nitrogen (NOx), and particulate matters (PM) from power plants were estimated and included. However, several deficiencies in evaluating the environmental costs were found. In this study, (1) the validity of the environmental costs used in the 6th BPE was assessed, (2) a systematic approach was suggested and used to improve the environmental costs estimation, and (3) the sensitivity of the cost of generating electricity to the environmental costs by fuel type with the proposed approach was discussed. We found that the applied environmental costs used in the 6th BPE did not fully include the demographic characteristics of Korea. By applying more realistic parameter values, it was found that the newly estimated environmental cost was about 23 times higher than the cost estimated in the original 6th BPE for coal-fired power plants and about 1.5 times higher for liquefied natural gas (LNG)-fired power plants, suggesting that LNG-fired power plants are more economical if using more realistic environmental costs. Thus, it is critical to check the validity of parameter values when calculating environmental costs.  相似文献   
69.
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates.  相似文献   
70.
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