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   1602097篇
  免费   131266篇
  国内免费   2578篇
耳鼻咽喉   21646篇
儿科学   52937篇
妇产科学   46230篇
基础医学   227784篇
口腔科学   47197篇
临床医学   140934篇
内科学   314804篇
皮肤病学   34099篇
神经病学   130117篇
特种医学   64744篇
外国民族医学   474篇
外科学   243817篇
综合类   39722篇
现状与发展   3篇
一般理论   544篇
预防医学   122889篇
眼科学   36472篇
药学   121254篇
  3篇
中国医学   2974篇
肿瘤学   87297篇
  2018年   14767篇
  2016年   12902篇
  2015年   15026篇
  2014年   20648篇
  2013年   31356篇
  2012年   42554篇
  2011年   44759篇
  2010年   26337篇
  2009年   25310篇
  2008年   43004篇
  2007年   45248篇
  2006年   46069篇
  2005年   44683篇
  2004年   44096篇
  2003年   42191篇
  2002年   41298篇
  2001年   75685篇
  2000年   78334篇
  1999年   66392篇
  1998年   17732篇
  1997年   16338篇
  1996年   16315篇
  1995年   16020篇
  1994年   15072篇
  1993年   14217篇
  1992年   55430篇
  1991年   53782篇
  1990年   52564篇
  1989年   50838篇
  1988年   47225篇
  1987年   46567篇
  1986年   44289篇
  1985年   42851篇
  1984年   32037篇
  1983年   27566篇
  1982年   16145篇
  1981年   14438篇
  1980年   13565篇
  1979年   30460篇
  1978年   21066篇
  1977年   17764篇
  1976年   16695篇
  1975年   17579篇
  1974年   21487篇
  1973年   20676篇
  1972年   18854篇
  1971年   17773篇
  1970年   16293篇
  1969年   15270篇
  1968年   13950篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
The first COVID-19 vaccination was given in December 2020 and there is an effort to vaccinate the international population on a massive scale. Common side effects from the vaccine include headache and tiredness. Regional lymphadenopathy has been described in relation to other vaccines. We describe two cases of supraclavicular reactive lymphadenopathy presenting in patients who had the COVID vaccination in the ipsilateral arm. Awareness of this diagnosis is important for patients presenting to the neck lump clinic.  相似文献   
73.
74.
Journal of Behavioral Medicine - Understanding associations between mothers’ and children’s physical activity and sedentary behavior on more fine-grained timescales can provide insights...  相似文献   
75.
76.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  相似文献   
77.
78.
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Gefahrstoffe sind in der Arbeitswelt allgegenwärtig. Beschäftigte aus allen Branchen sind bei ihrer Arbeit mit...  相似文献   
79.
80.

Objectives

To investigate whether functional overreaching affects locomotor system behaviour when running at fixed relative intensities and if any effects were associated with changes in running performance.

Design

Prospective intervention study.

Methods

Ten trained male runners completed three training blocks in a fixed order. Training consisted of one week of light training (baseline), two weeks of heavy training designed to induce functional overreaching, and ten days of light taper training designed to allow athletes to recover from, and adapt to, the heavy training. Locomotor behaviour, 5-km time trial performance, and subjective reports of training status (Daily Analysis of Life Demands for Athletes (DALDA) questionnaire) were assessed at the completion of each training block. Locomotor behaviour was assessed using detrended fluctuation analysis of stride intervals during running at speeds corresponding to 65% and 85% of maximum heart rate (HRmax) at baseline.

Results

Time trial performance (effect size ±95% confidence interval (ES): 0.16 ± 0.06; p < 0.001), locomotor behaviour at 65% HRmax (ES: ?1.12 ± 0.95; p = 0.026), and DALDA (ES: 2.55 ± 0.80; p < 0.001) were all detrimentally affected by the heavy training. Time trial performance improved relative to baseline after the taper (ES: ?0.16 ± 0.10; p = 0.003) but locomotor behaviour at 65% HRmax (ES: ?1.18 ± 1.17; p = 0.048) and DALDA (ES: 0.92 ± 0.90; p = 0.045) remained impaired.

Conclusions

Locomotor behaviour during running at 65% HRmax was impaired by functional overreaching and remained impaired after a 10-day taper, despite improved running performance. Locomotor changes may increase injury risk and should be considered within athlete monitoring programs independently of performance changes.  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