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   19375篇
  免费   1230篇
  国内免费   216篇
耳鼻咽喉   242篇
儿科学   665篇
妇产科学   458篇
基础医学   2577篇
口腔科学   249篇
临床医学   1586篇
内科学   3637篇
皮肤病学   344篇
神经病学   1383篇
特种医学   705篇
外国民族医学   1篇
外科学   2416篇
综合类   486篇
一般理论   23篇
预防医学   2993篇
眼科学   494篇
药学   1123篇
  2篇
中国医学   142篇
肿瘤学   1295篇
  2024年   78篇
  2023年   205篇
  2022年   363篇
  2021年   644篇
  2020年   309篇
  2019年   529篇
  2018年   631篇
  2017年   447篇
  2016年   472篇
  2015年   552篇
  2014年   724篇
  2013年   1040篇
  2012年   1474篇
  2011年   1524篇
  2010年   933篇
  2009年   742篇
  2008年   1106篇
  2007年   1196篇
  2006年   1120篇
  2005年   946篇
  2004年   900篇
  2003年   829篇
  2002年   716篇
  2001年   356篇
  2000年   303篇
  1999年   259篇
  1998年   130篇
  1997年   130篇
  1996年   98篇
  1995年   93篇
  1994年   92篇
  1993年   63篇
  1992年   155篇
  1991年   142篇
  1990年   164篇
  1989年   187篇
  1988年   157篇
  1987年   149篇
  1986年   129篇
  1985年   113篇
  1984年   80篇
  1983年   63篇
  1982年   35篇
  1981年   37篇
  1980年   29篇
  1979年   46篇
  1978年   22篇
  1975年   35篇
  1973年   23篇
  1972年   21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.
Nonorganic failure-to-thrive is a medical-psychological disorder reflecting lack of growth in an infant without apparent physical causes. Children who fail to thrive as infants are at high risk for developmental delays, personality problems, abuse, and death. This article focuses on environmental failure-to-thrive, describing the behavioral characteristics of the nonthriving infant and the family milieu. Aspects of early environments of NOFT infants are profiled, specific intervention strategies are discussed, and recommendations regarding the promotion of intense, consistent multi-disciplinary intervention strategies are advanced.  相似文献   
6.
7.
8.
A survey was performed on the radiotherapy practice of malignant pleural mesothelioma in The Netherlands and Belgium in 2002. Thirty-eight out of 47 centres (81%) responded. Prophylactic radiotherapy to intervention sites is given by 32/38 (84%) centres, with all centres offering palliative radiation. For both prophylactic and palliative indications, all centres use hypo-fractionated schedules. The present study shows that in the radiotherapy community in The Netherlands and in Belgium, a de facto consensus exists that both prophylactic and symptomatic radiotherapy to intervention sites of malignant pleural mesothelioma are effective and that hypo-fractionated schedules should be used.  相似文献   
9.
10.
Controversy persists regarding whether the efficacy of closed instrumental mitral commissurotomy compares well enough with that of open commissurotomy to warrant its continued use. The purpose of this study was to compare the results of operation as determined by catheterization studies in 63 patients with pure, severe, and noncalcified mitral stenosis. The patients were randomly assigned to one of two groups: thirty-two patients were operated on by the closed technique (group I) and 31 by the open technique (group II). All patients underwent left-sided and right-sided catheterization before and 4 months after operation. Preoperatively the two groups were statistically similar with regard to major clinical data and hemodynamic findings. There were no deaths at operation or systemic embolism in the two groups. The prevalence of surgically induced mitral regurgitation was similar in the two groups (12.4% versus 12.9%). Pulmonary arterial pressure and arteriolar and total pulmonary vascular resistance decreased significantly in the two groups. Pulmonary capillary wedge pressure decreased from 23.3 +/- 8.5 to 15.8 +/- 7 mm Hg in group I (p less than 0.001) and from 23.7 +/- 6 to 14 +/- 5.8 mm Hg in group II (p less than 0.001). Cardiac index increased from 2.86 +/- 0.84 to 3.14 +/- 0.78 L/min/m2 in group I, but this increase did not reach statistical significance. In group II cardiac index increased from 2.89 +/- 0.6 to 3.6 +/- 0.6 L/min/m2 (p less than 0.005). The mean and end-diastolic transmitral pressure gradients decreased significantly in the two groups, but the decrease was statistically greater in the open mitral commissurotomy group (p less than 0.001). Mitral valve area increased from 0.82 +/- 0.18 to 1.4 +/- 0.40 cm2 in group I (p less than 0.01) and from 0.84 +/- 0.15 to 2.14 +/- 0.53 cm2 in group II (p less than 0.001). The mean increase in mitral valve area was 0.61 cm2 in group I and 1.34 cm2 in group II (p less than 0.001). At exercise, in patients with resting pulmonary capillary wedge pressures of 18 mm Hg or less, cardiac index increased by 36% in group I (23 patients) and 48% in group II (24 patients), because of a smaller mitral valve area in group I (1.61 +/- 0.39 cm2) than in group II (2.45 +/- 0.65 cm2). Thus open commissurotomy improved hemodynamic values to a greater extent than closed commissurotomy at both rest and exercise.(ABSTRACT TRUNCATED AT 400 WORDS)  相似文献   
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