全文获取类型
收费全文 | 1368144篇 |
免费 | 103963篇 |
国内免费 | 2167篇 |
专业分类
耳鼻咽喉 | 19198篇 |
儿科学 | 46919篇 |
妇产科学 | 36807篇 |
基础医学 | 196100篇 |
口腔科学 | 36069篇 |
临床医学 | 119188篇 |
内科学 | 275767篇 |
皮肤病学 | 29326篇 |
神经病学 | 109380篇 |
特种医学 | 54710篇 |
外国民族医学 | 665篇 |
外科学 | 207184篇 |
综合类 | 27451篇 |
现状与发展 | 2篇 |
一般理论 | 447篇 |
预防医学 | 106255篇 |
眼科学 | 29338篇 |
药学 | 100105篇 |
2篇 | |
中国医学 | 2622篇 |
肿瘤学 | 76739篇 |
出版年
2019年 | 10618篇 |
2018年 | 15052篇 |
2017年 | 11540篇 |
2016年 | 12652篇 |
2015年 | 14354篇 |
2014年 | 19908篇 |
2013年 | 29761篇 |
2012年 | 41526篇 |
2011年 | 43669篇 |
2010年 | 25773篇 |
2009年 | 24830篇 |
2008年 | 41483篇 |
2007年 | 44227篇 |
2006年 | 44299篇 |
2005年 | 42995篇 |
2004年 | 41447篇 |
2003年 | 40062篇 |
2002年 | 39012篇 |
2001年 | 66695篇 |
2000年 | 69083篇 |
1999年 | 58750篇 |
1998年 | 16229篇 |
1997年 | 14680篇 |
1996年 | 15134篇 |
1995年 | 14225篇 |
1994年 | 13485篇 |
1993年 | 12436篇 |
1992年 | 46213篇 |
1991年 | 44926篇 |
1990年 | 43613篇 |
1989年 | 41426篇 |
1988年 | 38126篇 |
1987年 | 37329篇 |
1986年 | 34661篇 |
1985年 | 33303篇 |
1984年 | 24873篇 |
1983年 | 20913篇 |
1982年 | 12090篇 |
1981年 | 11011篇 |
1979年 | 21946篇 |
1978年 | 15177篇 |
1977年 | 12837篇 |
1976年 | 11939篇 |
1975年 | 12881篇 |
1974年 | 14965篇 |
1973年 | 14428篇 |
1972年 | 13220篇 |
1971年 | 11994篇 |
1970年 | 11269篇 |
1969年 | 10223篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
In the 6th Basic Plan for Long-Term Electricity Supply and Demand (6th BPE) for Korea, for the first time, the environmental costs of air pollution caused by oxides of sulfur (SOx), oxides of nitrogen (NOx), and particulate matters (PM) from power plants were estimated and included. However, several deficiencies in evaluating the environmental costs were found. In this study, (1) the validity of the environmental costs used in the 6th BPE was assessed, (2) a systematic approach was suggested and used to improve the environmental costs estimation, and (3) the sensitivity of the cost of generating electricity to the environmental costs by fuel type with the proposed approach was discussed. We found that the applied environmental costs used in the 6th BPE did not fully include the demographic characteristics of Korea. By applying more realistic parameter values, it was found that the newly estimated environmental cost was about 23 times higher than the cost estimated in the original 6th BPE for coal-fired power plants and about 1.5 times higher for liquefied natural gas (LNG)-fired power plants, suggesting that LNG-fired power plants are more economical if using more realistic environmental costs. Thus, it is critical to check the validity of parameter values when calculating environmental costs. 相似文献
22.
23.
24.
25.
26.
Marta Rozanski Valentin Neuhaus Emily Thornton Stéphanie J. E. Becker James P. Rathmell David Ring 《Journal of hand and microsurgery》2015,7(1):30-35
This study used the National Survey of Ambulatory Surgery (NSAS) database to measure the incidence of and risk factors for symptoms in the ambulatory surgery center and problems within 24 h after isolated carpal tunnel release (CTR). The NSAS contained records on 400,000 adult patients with carpal tunnel syndrome who were treated with CTR in 2006, based on ICD-9 codes. The type of anesthesia used and factors associated with symptoms and problems were sought in bivariate and multivariable statistical analyses. The mean duration of the procedure was 16 ± 8.8 min. Only 5 % were performed under local anesthesia without sedation, 45 % with IV sedation, 28 % regional anesthesia, and 19 % general anesthesia. Symptoms in the ambulatory surgery center or a problem within 24 h after discharge were recorded in 10 % of patients, all of them minor and transient, including difficulties with pain and its treatment. The strongest risk factors were male sex, age of 45 years and older, and participation of an anesthesiologist. Local anesthesia and regional anesthesia were associated with more perioperative symptoms and postoperative problems. Most CTR are performed with some sedation in the United States. CTR is a safe procedure: one in 10 patients will experience a minor issue in the perioperative or immediate postoperative period. 相似文献
27.
28.
29.
30.