全文获取类型
收费全文 | 2375846篇 |
免费 | 195057篇 |
国内免费 | 4209篇 |
专业分类
耳鼻咽喉 | 34271篇 |
儿科学 | 72798篇 |
妇产科学 | 62941篇 |
基础医学 | 335034篇 |
口腔科学 | 67545篇 |
临床医学 | 215663篇 |
内科学 | 468818篇 |
皮肤病学 | 47994篇 |
神经病学 | 200843篇 |
特种医学 | 96036篇 |
外国民族医学 | 886篇 |
外科学 | 360541篇 |
综合类 | 56225篇 |
现状与发展 | 1篇 |
一般理论 | 977篇 |
预防医学 | 190651篇 |
眼科学 | 55481篇 |
药学 | 177613篇 |
4篇 | |
中国医学 | 4365篇 |
肿瘤学 | 126425篇 |
出版年
2018年 | 24225篇 |
2016年 | 20597篇 |
2015年 | 23301篇 |
2014年 | 33561篇 |
2013年 | 50868篇 |
2012年 | 68797篇 |
2011年 | 72337篇 |
2010年 | 42511篇 |
2009年 | 40896篇 |
2008年 | 68812篇 |
2007年 | 73159篇 |
2006年 | 74037篇 |
2005年 | 72078篇 |
2004年 | 69371篇 |
2003年 | 67061篇 |
2002年 | 66319篇 |
2001年 | 112493篇 |
2000年 | 116582篇 |
1999年 | 98361篇 |
1998年 | 27876篇 |
1997年 | 25538篇 |
1996年 | 25455篇 |
1995年 | 24616篇 |
1994年 | 23165篇 |
1993年 | 21560篇 |
1992年 | 79399篇 |
1991年 | 76409篇 |
1990年 | 73586篇 |
1989年 | 70851篇 |
1988年 | 65853篇 |
1987年 | 64806篇 |
1986年 | 61344篇 |
1985年 | 58409篇 |
1984年 | 44230篇 |
1983年 | 37664篇 |
1982年 | 22890篇 |
1981年 | 20337篇 |
1980年 | 19039篇 |
1979年 | 41308篇 |
1978年 | 28994篇 |
1977年 | 24353篇 |
1976年 | 22835篇 |
1975年 | 23967篇 |
1974年 | 29647篇 |
1973年 | 28052篇 |
1972年 | 26238篇 |
1971年 | 24159篇 |
1970年 | 22763篇 |
1969年 | 21097篇 |
1968年 | 19143篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
Stuart J. Dilley Tracey J. Weiland Robert O’Brien Neil J. Cunningham Julian E. Van Dijk Rosie M. Mahoney 《Teaching and learning in medicine》2015,27(1):71-79
Theory: Immersive simulation is a common mode of education for medical students. Observation of clinical simulations prior to participation is believed to be beneficial, though this is often a passive process. Active observation may be more beneficial. Hypotheses: The hypothesis tested in this study was that the active use of a simple checklist during observation of an immersive simulation would result in better participant performance in a subsequent scenario compared with passive observation alone. Methods: Medical students were randomized to either passive or active (with checklist) observation of an immersive simulation involving cardiac arrest prior to participating in their own simulation. Performance measures included time to cardiopulmonary resuscitation (CPR) and time to defibrillation and were compared between first and second scenarios as well as between passive and active observers. Results: Seventy-nine simulations involving 232 students were conducted. Mean time to CPR was 18 seconds (SD = 11.6) for those using the checklist and 24 seconds (SD = 15.8) for those who observed passively (M difference = 6 seconds), t(35) = 1.46, p =.153. Time to defibrillation was 94 seconds (SD = 26.4) for those using the checklist and 92 seconds (SD = 23.8) for those who observed passively (M difference = –2 seconds), t(38) =.21, p =.837. Time to CPR was 24 seconds (SD = 15.8) for passive observers and 31 seconds (SD = 21.0; M difference = 7 seconds), t(35) = 1.13, p =.265, for their first scenario counterparts. Time to CPR was 18 seconds (SD = 11.6) for active observers and 36 seconds (SD = 26.2; M difference = 18 seconds), t(24) = 2.81, p =.010, for their first scenario counterparts. Time to defibrillation was 92 seconds (SD = 23.8) for passive observers and 125 seconds (SD = 32.2; M difference = 33 seconds), t(33) = 3.63, p =.001, for their first scenario counterparts. Time to defibrillation was 94 seconds (SD = 26.4) for the active observers and 132 seconds (SD = 52.9; M difference = 38 seconds), t(28) =.46, p =.008, for their first scenario counterparts. Conclusions: Observation alone leads to improved performance in the management of a simulated cardiac arrest. The active use of a simple skills-based checklist during observation did not appear to improve performance over passive observation alone. 相似文献
73.
74.
75.
76.
77.
78.
79.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
80.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618