全文获取类型
收费全文 | 45254篇 |
免费 | 4007篇 |
国内免费 | 1654篇 |
专业分类
耳鼻咽喉 | 168篇 |
儿科学 | 203篇 |
妇产科学 | 240篇 |
基础医学 | 2635篇 |
口腔科学 | 1024篇 |
临床医学 | 5380篇 |
内科学 | 1994篇 |
皮肤病学 | 277篇 |
神经病学 | 834篇 |
特种医学 | 829篇 |
外科学 | 2264篇 |
综合类 | 14870篇 |
现状与发展 | 2篇 |
一般理论 | 7篇 |
预防医学 | 5591篇 |
眼科学 | 351篇 |
药学 | 6759篇 |
720篇 | |
中国医学 | 6248篇 |
肿瘤学 | 519篇 |
出版年
2024年 | 269篇 |
2023年 | 724篇 |
2022年 | 1845篇 |
2021年 | 2179篇 |
2020年 | 1998篇 |
2019年 | 986篇 |
2018年 | 886篇 |
2017年 | 1287篇 |
2016年 | 1392篇 |
2015年 | 1481篇 |
2014年 | 3429篇 |
2013年 | 3078篇 |
2012年 | 3495篇 |
2011年 | 3764篇 |
2010年 | 2977篇 |
2009年 | 2443篇 |
2008年 | 2621篇 |
2007年 | 2792篇 |
2006年 | 2250篇 |
2005年 | 1717篇 |
2004年 | 1319篇 |
2003年 | 1012篇 |
2002年 | 798篇 |
2001年 | 693篇 |
2000年 | 607篇 |
1999年 | 533篇 |
1998年 | 448篇 |
1997年 | 393篇 |
1996年 | 384篇 |
1995年 | 354篇 |
1994年 | 346篇 |
1993年 | 324篇 |
1992年 | 287篇 |
1991年 | 248篇 |
1990年 | 211篇 |
1989年 | 196篇 |
1988年 | 191篇 |
1987年 | 164篇 |
1986年 | 147篇 |
1985年 | 158篇 |
1984年 | 90篇 |
1983年 | 55篇 |
1982年 | 93篇 |
1981年 | 50篇 |
1980年 | 37篇 |
1979年 | 31篇 |
1978年 | 30篇 |
1977年 | 22篇 |
1976年 | 27篇 |
1974年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
浅谈多媒体教学中存在的问题及对策 总被引:17,自引:2,他引:15
分析了目前多媒体教学中存在的一些问题,提出了一些提高多媒体教学质量的途径和方法。 相似文献
62.
63.
64.
65.
Katsuyoshi Hori Maroh Suzuki Shigeru Tanda Sachiko Saito Mika Shinozaki Qiu-Hang Zhang 《Cancer science》1991,82(11):1309-1316
To elucidate the significance of angiotensin II (AID-induced hypertension chemotherapy, changes of tissue blood flow both in normal subcutis and in tumors (AH109A, LY80) were measured with the hydrogen gas clearance method. A newly-developed anesthetic machine was used to keep the animals' condition constant. Tissue blood flow in normal subcutis and tumors always fluctuated with time under normotension. The nature and the rate of fluctuation in tumor Wood flow were almost identical in two different types of tumors. However, the fluctuation of blood flow in tumor and that in normal subcutis were almost always inversely related when blood flows in these different tissues were measured simultaneously, i.e., when tissue blood flow in normal subcutis decreased, tumor blood flow increased, and vice versa. The findings supported the idea that the connection mode between the tumor vascular bed and normal vascular bed is a parallel circuit. Vascular resistance in the normal vascular bed under All-induced hypertension seemed to be greater than that under normotension, because the All-increased tumor blood flow always exceeded the maximum tumor blood flow under normotension. Due to the fluctuations of tumor blood flow, no-flow or low-flow areas, resistant to delivery of anti-cancer drugs, moved sporadically within the tumor under the normotensive condition. However, good conditions for drug delivery to tumor tissue were induced by All-induced hypertension. 相似文献
66.
本文联系医学生物学实验课程和多媒体技术的特点,探讨了多媒体技术在医学生物学实验教学中的应用。指出在基础医学实验教学中教师要利用多媒体技术的优点,结合课件制作和教学中应注意的问题,才能充分发挥多媒体技术在教学中的作用,提高教学质量。 相似文献
67.
Martin V. Pusic MD George S. Pachev PhD Wendy A. MacDonald MD 《Academic emergency medicine》2007,14(2):138-148
Objectives
To explore medical students' use of computer tutorials embedded in a busy clinical setting; to demonstrate that such tutorials can increase knowledge gain over and above that attributable to the clinical rotation itself.
Methods
Six tutorials were installed on a computer placed in a central area in an emergency department. Each tutorial was made up of between 33 and 85 screens of information that include text, graphics, animations, and questions. They were designed to be brief (10 minutes), focused, interactive, and immediately relevant. The authors evaluated the intervention using quantitative research methods, including usage tracking, surveys of faculty and students, and a randomized pretest-posttest study.
Results
Over 46 weeks, 95 medical students used the tutorials 544 times, for an overall average of 1.7 times a day. The median time spent on completed tutorials was 11 minutes (average [SD], 14 [±12] minutes). Seventy-four students completed the randomized study. They completed 65% of the assigned tutorials, resulting in improved examination scores compared with the control (effect size, 0.39; 95% confidence interval = 0.15 to 0.62). Students were positively disposed to the tutorials, ranking them as "valuable." Fifty-four percent preferred the tutorials to small group teaching sessions with a preceptor. The faculty was also positive about the tutorials, although they did not appear to integrate the tutorials directly into their teaching.
Conclusions
Medical students on rotation in a busy clinical setting can and will use appropriately presented computer tutorials. The tutorials are effective in raising examination scores. 相似文献
To explore medical students' use of computer tutorials embedded in a busy clinical setting; to demonstrate that such tutorials can increase knowledge gain over and above that attributable to the clinical rotation itself.
Methods
Six tutorials were installed on a computer placed in a central area in an emergency department. Each tutorial was made up of between 33 and 85 screens of information that include text, graphics, animations, and questions. They were designed to be brief (10 minutes), focused, interactive, and immediately relevant. The authors evaluated the intervention using quantitative research methods, including usage tracking, surveys of faculty and students, and a randomized pretest-posttest study.
Results
Over 46 weeks, 95 medical students used the tutorials 544 times, for an overall average of 1.7 times a day. The median time spent on completed tutorials was 11 minutes (average [SD], 14 [±12] minutes). Seventy-four students completed the randomized study. They completed 65% of the assigned tutorials, resulting in improved examination scores compared with the control (effect size, 0.39; 95% confidence interval = 0.15 to 0.62). Students were positively disposed to the tutorials, ranking them as "valuable." Fifty-four percent preferred the tutorials to small group teaching sessions with a preceptor. The faculty was also positive about the tutorials, although they did not appear to integrate the tutorials directly into their teaching.
Conclusions
Medical students on rotation in a busy clinical setting can and will use appropriately presented computer tutorials. The tutorials are effective in raising examination scores. 相似文献
68.
目的确定蝇类季节消长的高峰日和高峰时段,为制定蝇类防制措施提供科学依据。方法用圆形分布法统计分析绍兴市区2003-2004年蝇类密度监测数据。结果绍兴市区2003-2004年蝇类平均密度高峰日为8月4日,高峰时段为6月8日至9月30日。其中2003年蝇类密度高峰日为8月11日,高峰时段为6月17日至10月5日;2004年蝇类密度高峰日为7月29日,高峰时段为6月1日至9月26日。结论绍兴市区2年中蝇类消长有明显的季节性规律。 相似文献
69.
70.