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   177755篇
  免费   1102篇
  国内免费   59篇
耳鼻咽喉   1187篇
儿科学   6745篇
妇产科学   3131篇
基础医学   16637篇
口腔科学   1605篇
临床医学   12550篇
内科学   31670篇
皮肤病学   683篇
神经病学   16542篇
特种医学   8994篇
外科学   29132篇
综合类   2394篇
一般理论   1篇
预防医学   18166篇
眼科学   2878篇
药学   9576篇
中国医学   642篇
肿瘤学   16383篇
  2023年   27篇
  2022年   57篇
  2021年   125篇
  2020年   60篇
  2019年   90篇
  2018年   21996篇
  2017年   17418篇
  2016年   19568篇
  2015年   1007篇
  2014年   912篇
  2013年   909篇
  2012年   7166篇
  2011年   21181篇
  2010年   18913篇
  2009年   11599篇
  2008年   19659篇
  2007年   21889篇
  2006年   718篇
  2005年   2337篇
  2004年   3473篇
  2003年   4425篇
  2002年   2547篇
  2001年   302篇
  2000年   442篇
  1999年   188篇
  1998年   208篇
  1997年   223篇
  1996年   95篇
  1995年   110篇
  1994年   101篇
  1993年   63篇
  1992年   47篇
  1991年   99篇
  1990年   133篇
  1989年   85篇
  1988年   65篇
  1987年   48篇
  1986年   25篇
  1985年   38篇
  1984年   24篇
  1983年   26篇
  1982年   25篇
  1980年   43篇
  1969年   21篇
  1938年   60篇
  1937年   25篇
  1935年   22篇
  1934年   30篇
  1932年   57篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 459 毫秒
11.
12.
Contraceptive use is an important strategy for the prevention of unwanted pregnancy and avoidance of induced abortion. Of all the contraception methods, emergency contraceptive (EC) offers the last chance to achieve this. However, few studies have documented the use of EC among young people in Ghana. This study explored knowledge and usage of EC as well as the factors associated with it among University of Cape Coast students. Data were obtained on the knowledge and usage of ECs among University of Cape Coast students in 2013. Logistic regression analysis was used to investigate the association between students’ socio-demographic characteristics and EC knowledge and use. More male students (72 %) than females (59 %) were sexually active. Fifty-seven percent of the respondents had ever heard of EC and 36 % had ever used EC. Although males were more likely to be sexually active, females were more likely to have knowledge of EC use compared to males. The study underscores the need to increase awareness regarding EC among University students in order to offer them the opportunity that EC provides if other forms of contraceptives are missed.  相似文献   
13.
14.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial.  相似文献   
15.
16.
17.
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