全文获取类型
收费全文 | 77304篇 |
免费 | 3138篇 |
国内免费 | 49篇 |
出版年
2020年 | 860篇 |
2019年 | 1072篇 |
2018年 | 1524篇 |
2017年 | 1515篇 |
2016年 | 1620篇 |
2015年 | 1089篇 |
2014年 | 1356篇 |
2013年 | 6510篇 |
2012年 | 2447篇 |
2011年 | 2594篇 |
2010年 | 1540篇 |
2009年 | 1606篇 |
2008年 | 2317篇 |
2007年 | 2291篇 |
2006年 | 2039篇 |
2005年 | 1814篇 |
2004年 | 1799篇 |
2003年 | 1622篇 |
2002年 | 1686篇 |
2001年 | 2492篇 |
2000年 | 2432篇 |
1999年 | 1853篇 |
1998年 | 931篇 |
1997年 | 822篇 |
1996年 | 754篇 |
1995年 | 768篇 |
1994年 | 716篇 |
1993年 | 744篇 |
1992年 | 1478篇 |
1991年 | 1399篇 |
1990年 | 1366篇 |
1989年 | 1258篇 |
1988年 | 1238篇 |
1987年 | 1174篇 |
1986年 | 1181篇 |
1985年 | 1273篇 |
1984年 | 1020篇 |
1983年 | 895篇 |
1982年 | 734篇 |
1979年 | 1035篇 |
1978年 | 766篇 |
1975年 | 873篇 |
1974年 | 1007篇 |
1973年 | 987篇 |
1972年 | 879篇 |
1971年 | 766篇 |
1969年 | 718篇 |
1968年 | 908篇 |
1967年 | 862篇 |
1966年 | 781篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
123.
125.
The principles, design considerations, and components of a clinical information system intended to support and enhance the patient care, educational, and research missions of a comprehensive psychiatric institute are presented. Major characteristics of the system are its emphases on efficiency, simplicity, and intensive user involvement throughout the development of the system. 相似文献
126.
127.
Michael A Rapoff John Belmont Carol Lindsley Nancy Olson Judy Morris Joni Padur 《Health psychology》2002,21(6):620-623
Adherence to medications for chronic pediatric diseases decreases overtime. This randomized controlled trial evaluated a clinic-based, nurse-administered educational and behavioral intervention to prevent the anticipated drop in adherence to nonsteroidal medications among newly diagnosed patients with juvenile rheumatoid arthritis. Thirty-four participants completed the study (mean age = 8.44 years, SD = 3.96), including 19 in the experimental group and 15 in the standard-treatment (education) control group. There were significant group and Group x Time effects for adherence (assessed with an electronic monitor over a 13-month period) favoring the experimental group. In contrast, the groups did not differ significantly in disease activity or functional limitations. Factors that may have prevented detection of differences in these health parameters are dicussed. 相似文献
128.
129.
130.
We carried out a randomized controlled trial to determine whether an intensive intervention after a suicide attempt could decrease by half the risk of a repeat attempt in the following two years. After initial assessment and randomization, experimental subjects attended 18 therapy appointments over one year, including one home visit, and measures to improve attendance. Control subjects received the usual care. Of 63 experimental subjects, 35% made a repeat attempt, and so did 30% of 63 control subjects. The study had a 99% power to detect the desired decrease of risk (30% to 15%). Clearly, the intervention did not achieve its objective. 相似文献