全文获取类型
收费全文 | 45040篇 |
免费 | 5109篇 |
国内免费 | 167篇 |
专业分类
耳鼻咽喉 | 323篇 |
儿科学 | 1323篇 |
妇产科学 | 900篇 |
基础医学 | 6226篇 |
口腔科学 | 1247篇 |
临床医学 | 5712篇 |
内科学 | 8903篇 |
皮肤病学 | 698篇 |
神经病学 | 3615篇 |
特种医学 | 1878篇 |
外国民族医学 | 1篇 |
外科学 | 5954篇 |
综合类 | 1190篇 |
一般理论 | 26篇 |
预防医学 | 5248篇 |
眼科学 | 846篇 |
药学 | 3790篇 |
中国医学 | 78篇 |
肿瘤学 | 2358篇 |
出版年
2021年 | 586篇 |
2020年 | 357篇 |
2019年 | 644篇 |
2018年 | 734篇 |
2017年 | 526篇 |
2016年 | 601篇 |
2015年 | 713篇 |
2014年 | 941篇 |
2013年 | 1376篇 |
2012年 | 1990篇 |
2011年 | 2001篇 |
2010年 | 1131篇 |
2009年 | 1104篇 |
2008年 | 1901篇 |
2007年 | 2051篇 |
2006年 | 1971篇 |
2005年 | 1900篇 |
2004年 | 1744篇 |
2003年 | 1661篇 |
2002年 | 1626篇 |
2001年 | 1541篇 |
2000年 | 1478篇 |
1999年 | 1465篇 |
1998年 | 624篇 |
1997年 | 490篇 |
1996年 | 502篇 |
1995年 | 493篇 |
1994年 | 441篇 |
1993年 | 479篇 |
1992年 | 1216篇 |
1991年 | 1127篇 |
1990年 | 1082篇 |
1989年 | 1051篇 |
1988年 | 980篇 |
1987年 | 976篇 |
1986年 | 987篇 |
1985年 | 900篇 |
1984年 | 773篇 |
1983年 | 634篇 |
1982年 | 427篇 |
1981年 | 352篇 |
1979年 | 587篇 |
1978年 | 485篇 |
1977年 | 373篇 |
1976年 | 386篇 |
1974年 | 433篇 |
1973年 | 400篇 |
1972年 | 386篇 |
1971年 | 350篇 |
1969年 | 358篇 |
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
991.
José G. Cabañas Jefferson G. Williams John M. Gallagher Jane H. Brice 《Prehospital emergency care》2021,25(1):8-15
Abstract The COVID-19 pandemic is a worldwide historical event that will continue to affect nearly every aspect of ordinary life, including affecting our economic, political, and healthcare eco-systems. An effective pandemic response demands a coordinated and integrated response across community healthcare stakeholders, including Public Health and Emergency Management Officials. EMS systems are in a unique position and perform an essential role on the frontlines of COVID-19, including facilitating coordination of response efforts to COVID-19 within their communities while supporting public health mitigation efforts to slow the spread of the SARS-CoV-2. EMS physicians serve their communities at a unique intersection as clinical leaders, population health experts, and advocates. This paper examines and recommends crucial roles for EMS physician leaders as communities work together in pandemic response. 相似文献
992.
Amrita Goyal MD Kristin Totoraitis MD Wael Toama MD Fiona He MD Kimberly Bohjanen MD Sarah Williams MD Daniel D. Miller MD 《Journal of cutaneous pathology》2020,47(7):643-648
Mycosis fungoides (MF) is an indolent, uncommon, non-Hodgkin T-cell lymphoma of the skin. It classically presents with patches, plaques, and tumors and may rarely show spread to internal organs or bone marrow. Up to 7.5% of MF patients may be diagnosed with a second malignancy. Intravascular large B-cell lymphoma (IVLBCL) is an exceedingly rare non-Hodgkin B-cell lymphoma characterized by predominant growth of large neoplastic cells in the lumina of blood vessels. This case presents with an unusual confluence of two rare diagnoses, MF and IVLBCL, made more remarkable by the presence of both diagnoses on a single skin biopsy sample. 相似文献
993.
Robert J. Williams Carrie A. Leonard Yale D. Belanger Darren R. Christensen Nady el-Guebaly David C. Hodgins Daniel S. McGrath Fiona Nicoll Rhys M.G. Stevens 《Revue canadienne de psychiatrie》2021,66(5):485
Objective:The purpose of this study was to provide an updated profile of gambling and problem gambling in Canada and to examine how the rates and pattern of participation compare to 2002.Method:An assessment of gambling and problem gambling was included in the 2018 Canadian Community Health Survey and administered to 24,982 individuals aged 15 and older. The present analyses selected for adults (18+).Results:A total of 66.2% of people reported engaging in some type of gambling in 2018, primarily lottery and/or raffle tickets, the only type in which the majority of Canadians participate. There are some significant interprovincial differences, with perhaps the most important one being the higher rate of electronic gambling machine (EGM) participation in Manitoba and Saskatchewan. The overall pattern of gambling in 2018 is very similar to 2002, although participation is generally much lower in 2018, particularly for EGMs and bingo. Only 0.6% of the population were identified as problem gamblers in 2018, with an additional 2.7% being at-risk gamblers. There is no significant interprovincial variation in problem gambling rates. The interprovincial pattern of problem gambling in 2018 is also very similar to what was found in 2002 with the main difference being a 45% decrease in the overall prevalence of problem gambling.Conclusions:Gambling and problem gambling have both decreased in Canada from 2002 to 2018 although the provincial patterns are quite similar between the 2 time periods. Several mechanisms have likely collectively contributed to these declines. Decreases have also been reported in several other Western countries in recent years and have occurred despite the expansion of legal gambling opportunities, suggesting a degree of inoculation or adaptation in large parts of the population. 相似文献
994.
995.
996.
997.
998.
999.