全文获取类型
收费全文 | 63782篇 |
免费 | 4665篇 |
国内免费 | 211篇 |
专业分类
耳鼻咽喉 | 804篇 |
儿科学 | 1408篇 |
妇产科学 | 843篇 |
基础医学 | 8148篇 |
口腔科学 | 958篇 |
临床医学 | 6790篇 |
内科学 | 13812篇 |
皮肤病学 | 789篇 |
神经病学 | 6402篇 |
特种医学 | 2186篇 |
外国民族医学 | 5篇 |
外科学 | 11463篇 |
综合类 | 624篇 |
一般理论 | 47篇 |
预防医学 | 4343篇 |
眼科学 | 1224篇 |
药学 | 4406篇 |
中国医学 | 71篇 |
肿瘤学 | 4335篇 |
出版年
2024年 | 50篇 |
2023年 | 454篇 |
2022年 | 745篇 |
2021年 | 2006篇 |
2020年 | 1212篇 |
2019年 | 1798篇 |
2018年 | 2187篇 |
2017年 | 1533篇 |
2016年 | 1633篇 |
2015年 | 1875篇 |
2014年 | 2703篇 |
2013年 | 3363篇 |
2012年 | 5252篇 |
2011年 | 5450篇 |
2010年 | 2928篇 |
2009年 | 2690篇 |
2008年 | 4383篇 |
2007年 | 4475篇 |
2006年 | 4265篇 |
2005年 | 4068篇 |
2004年 | 3632篇 |
2003年 | 3465篇 |
2002年 | 3091篇 |
2001年 | 419篇 |
2000年 | 319篇 |
1999年 | 389篇 |
1998年 | 616篇 |
1997年 | 482篇 |
1996年 | 379篇 |
1995年 | 326篇 |
1994年 | 288篇 |
1993年 | 269篇 |
1992年 | 199篇 |
1991年 | 159篇 |
1990年 | 128篇 |
1989年 | 110篇 |
1988年 | 114篇 |
1987年 | 97篇 |
1986年 | 90篇 |
1985年 | 81篇 |
1984年 | 118篇 |
1983年 | 100篇 |
1982年 | 108篇 |
1981年 | 99篇 |
1980年 | 112篇 |
1979年 | 47篇 |
1978年 | 48篇 |
1977年 | 45篇 |
1976年 | 33篇 |
1974年 | 33篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
996.
J Geoffrey Chase Christopher G Pretty Leesa Pfeifer Geoffrey M Shaw Jean-Charles Preiser Aaron J Le Compte Jessica Lin Darren Hewett Katherine T Moorhead Thomas Desaive 《Critical care (London, England)》2010,14(4):R154
Introduction
Intensive care unit mortality is strongly associated with organ failure rate and severity. The sequential organ failure assessment (SOFA) score is used to evaluate the impact of a successful tight glycemic control (TGC) intervention (SPRINT) on organ failure, morbidity, and thus mortality. 相似文献997.
998.
999.
Casimir Leknius DDS MS MA MBA Lola Giusti DDS David Chambers EdM MBA PhD Christopher Hong DDS 《Journal of prosthodontics》2010,19(2):138-143
Purpose: This study was undertaken to simultaneously compare instrumentation type and operator characteristics in judgments of clinical acceptability of crowns exhibiting a controlled range of marginal gaps. The research was conducted in a laboratory setting and generalizability analysis was used as a statistical technique to identify the sources contributing to variation in the judgment outcome. Materials and Methods: A crown was seated on an ivorine tooth in a device that permitted continuous adjustment in intervals of 25 μm to produce known marginal gaps ranging from zero to 250 μm. Forty‐nine students and six faculty members used five types of explorers each to determine, by tactile examination, the point on the controlled increasing marginal gap where they would no longer regard the gap as clinically acceptable. Results: There were no differences across type of explorer. Operators with clinical experience had a threshold that rejected crowns at a smaller gap than did those operators without clinical experience (p= 0.007). Faculty members maintained a higher individual degree of consistency in their personal judgments than did students (p= 0.02); however, the inter‐operator consistency was significantly lower for faculty members than for students (p < 0.05). Conclusions: Differences among operators in a simulation of the decision regarding gaps in crowns accounted for 63% of the variance; type of explorer used in assisting this decision accounted for about half as much variance. Faculty members making such judgments exhibited high intra‐operator consistency but significantly lower inter‐operator consistency than did students. The study suggests that the internal standards dentists use for clinical decision making deserves further study as they may be as significant as the equipment used. 相似文献
1000.