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   341022篇
  免费   11183篇
  国内免费   423篇
耳鼻咽喉   3319篇
儿科学   12043篇
妇产科学   6530篇
基础医学   39173篇
口腔科学   9148篇
临床医学   24374篇
内科学   68121篇
皮肤病学   5007篇
神经病学   30240篇
特种医学   13941篇
外国民族医学   26篇
外科学   49186篇
综合类   3671篇
现状与发展   1篇
一般理论   60篇
预防医学   35321篇
眼科学   5918篇
药学   19564篇
中国医学   1329篇
肿瘤学   25656篇
  2023年   821篇
  2022年   1635篇
  2021年   3667篇
  2020年   2465篇
  2019年   3472篇
  2018年   26171篇
  2017年   20493篇
  2016年   22347篇
  2015年   4816篇
  2014年   6183篇
  2013年   7590篇
  2012年   17479篇
  2011年   31716篇
  2010年   24064篇
  2009年   16333篇
  2008年   27645篇
  2007年   30369篇
  2006年   9060篇
  2005年   10938篇
  2004年   11615篇
  2003年   11869篇
  2002年   8069篇
  2001年   5224篇
  2000年   5366篇
  1999年   4518篇
  1998年   1739篇
  1997年   1481篇
  1996年   1353篇
  1995年   1171篇
  1994年   1167篇
  1993年   1032篇
  1992年   2694篇
  1991年   2656篇
  1990年   2456篇
  1989年   2405篇
  1988年   2158篇
  1987年   1986篇
  1986年   1845篇
  1985年   1779篇
  1984年   1277篇
  1983年   1033篇
  1982年   589篇
  1981年   515篇
  1980年   533篇
  1979年   923篇
  1978年   616篇
  1977年   483篇
  1975年   547篇
  1974年   561篇
  1973年   544篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
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   
73.
74.
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   
75.
76.
77.
Annals of Hematology - This study assessed treatment patterns and healthcare resource utilization (HRU) of patients with severe aplastic anemia (SAA) with insufficient response to immunosuppressive...  相似文献   
78.
79.
80.
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