全文获取类型
收费全文 | 23481篇 |
免费 | 310篇 |
国内免费 | 126篇 |
专业分类
教育 | 16542篇 |
科学研究 | 2501篇 |
各国文化 | 266篇 |
体育 | 1952篇 |
综合类 | 14篇 |
文化理论 | 248篇 |
信息传播 | 2394篇 |
出版年
2021年 | 179篇 |
2020年 | 348篇 |
2019年 | 503篇 |
2018年 | 698篇 |
2017年 | 661篇 |
2016年 | 664篇 |
2015年 | 451篇 |
2014年 | 549篇 |
2013年 | 4400篇 |
2012年 | 512篇 |
2011年 | 552篇 |
2010年 | 438篇 |
2009年 | 419篇 |
2008年 | 525篇 |
2007年 | 498篇 |
2006年 | 469篇 |
2005年 | 456篇 |
2004年 | 401篇 |
2003年 | 422篇 |
2002年 | 400篇 |
2001年 | 385篇 |
2000年 | 384篇 |
1999年 | 382篇 |
1998年 | 245篇 |
1997年 | 250篇 |
1996年 | 294篇 |
1995年 | 288篇 |
1994年 | 243篇 |
1993年 | 224篇 |
1992年 | 321篇 |
1991年 | 327篇 |
1990年 | 324篇 |
1989年 | 340篇 |
1988年 | 288篇 |
1987年 | 289篇 |
1986年 | 282篇 |
1985年 | 317篇 |
1984年 | 277篇 |
1983年 | 282篇 |
1982年 | 239篇 |
1981年 | 242篇 |
1980年 | 234篇 |
1979年 | 314篇 |
1978年 | 241篇 |
1977年 | 221篇 |
1976年 | 196篇 |
1975年 | 173篇 |
1974年 | 183篇 |
1973年 | 157篇 |
1971年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
Jennifer R. Warren Michael L. Hecht David A. Wagstaff Elvira Elek Khadidiatou Ndiaye Patricia Dustman Flavio F. Marsiglia 《Journal of Applied Communication Research》2006,34(2):209-227
This study sought to determine if exposure to two communication-oriented activities, videotapes and public service announcements, accounts for changes in substance use among adolescents participating in the Drug Resistance Strategies Project's keepin' it REAL adolescent substance use prevention curriculum. Middle-school students (4,734, 72% Latino) responded to questionnaires related to these analyses. An analysis of covariance (ANCOVA) model was fit separately to six substance use outcomes. The results suggested that intervention students who saw four or five videos engaged in less substance use in the past month than did students who saw fewer videos. Having seen the PSAs one or more times did not predict the reported change in substance use. 相似文献
974.
975.
976.
Children at risk for early reading difficulties were identified on entry into kindergarten, and half of these children received small-group intervention two to three times a week during their kindergarten year. The other half received whatever remedial assistance was offered by their home schools. These children were again assessed at the beginning of first grade, and those who continued to have difficulties in reading received either one-to-one daily tutoring offered by project teachers from the beginning to the end of first grade or whatever remedial assistance was offered by their home schools over the same time period. All target children were periodically assessed through the end of third grade. Results suggest that either kindergarten intervention alone or kindergarten intervention combined with first-grade intervention are both useful vehicles for preventing early and long-term reading difficulties in most at-risk children. 相似文献
977.
978.
979.
980.
Tested was the effect of two persuasive messages presented by a credible communicator on the attitudes toward energy conservation of 180 preservice elementary teachers. The study asked the following questions: (1) Can attitudes toward energy conservation be positively changed with a brief, belief-laden communication? (2) Do positive attitude gains between pre- and post-tests, if any, dissipate within three weeks following the treatment? (3) Do the integrated and the nonintegrated communications affect energy attitudes of three subgroups (abstract, concrete differentiator and concrete thinkers) of the sample differently? The important finding was that both experimental treatments, integrated and nonintegrated, were equally effective and significantly more effective in attitude change than the control. Secondly, the finding that neither experimental treatment dissipated in effect, at least for three weeks, suggests some duration of brief treatment periods. And finally, the attitude changes are as likely to occur when concrete differentiators are presented with a nonintegrated as an integrated treatment, but abstract thinkers exposed to the integrated treatment and concrete thinkers exposed to the nonintegrated treatment sustain a changed attitude to a greater degree than other combinations of treatment and cognitive processing styles. 相似文献