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   93301篇
  免费   42157篇
  国内免费   90篇
耳鼻咽喉   1646篇
儿科学   4474篇
妇产科学   738篇
基础医学   17770篇
口腔科学   5673篇
临床医学   13891篇
内科学   26352篇
皮肤病学   7907篇
神经病学   15039篇
特种医学   3350篇
外科学   16435篇
综合类   97篇
一般理论   27篇
预防医学   4953篇
眼科学   1619篇
药学   6423篇
中国医学   1056篇
肿瘤学   8098篇
  2024年   16篇
  2023年   153篇
  2022年   308篇
  2021年   1745篇
  2020年   5337篇
  2019年   11128篇
  2018年   10513篇
  2017年   11790篇
  2016年   12566篇
  2015年   12493篇
  2014年   12492篇
  2013年   13143篇
  2012年   5477篇
  2011年   5306篇
  2010年   9681篇
  2009年   5949篇
  2008年   3191篇
  2007年   2143篇
  2006年   2088篇
  2005年   1770篇
  2004年   1664篇
  2003年   1573篇
  2002年   1575篇
  2001年   924篇
  2000年   811篇
  1999年   431篇
  1998年   179篇
  1997年   155篇
  1996年   101篇
  1995年   69篇
  1994年   60篇
  1993年   57篇
  1992年   82篇
  1991年   51篇
  1990年   46篇
  1989年   50篇
  1988年   47篇
  1987年   30篇
  1986年   21篇
  1985年   22篇
  1984年   26篇
  1983年   19篇
  1982年   24篇
  1981年   18篇
  1980年   26篇
  1979年   17篇
  1978年   20篇
  1977年   14篇
  1974年   14篇
  1973年   18篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
According to the current nutritional recommendations issued by professional diabetes and nutrition associations, diabetic patients should keep to a diet consisting of 45–60% carbohydrates, 10–20% protein, and not more than 35% fat. However, not all of these nutritional recommendations are evidence based. For example, current studies show that the intake of insoluble roughage may be underrepresented. It is also possible that diabetic patients could benefit from keeping to the lower end of the recommended range for carbohydrates (45%) and the upper end of the range advised for protein (20%).  相似文献   
7.
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   
8.
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   
9.
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   
10.
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