全文获取类型
收费全文 | 4546篇 |
免费 | 65篇 |
国内免费 | 5篇 |
专业分类
教育 | 3333篇 |
科学研究 | 398篇 |
各国文化 | 57篇 |
体育 | 309篇 |
综合类 | 1篇 |
文化理论 | 65篇 |
信息传播 | 453篇 |
出版年
2022年 | 32篇 |
2021年 | 39篇 |
2020年 | 66篇 |
2019年 | 122篇 |
2018年 | 138篇 |
2017年 | 146篇 |
2016年 | 127篇 |
2015年 | 84篇 |
2014年 | 115篇 |
2013年 | 1123篇 |
2012年 | 96篇 |
2011年 | 95篇 |
2010年 | 79篇 |
2009年 | 76篇 |
2008年 | 105篇 |
2007年 | 87篇 |
2006年 | 80篇 |
2005年 | 75篇 |
2004年 | 71篇 |
2003年 | 82篇 |
2002年 | 81篇 |
2001年 | 62篇 |
2000年 | 85篇 |
1999年 | 69篇 |
1998年 | 49篇 |
1997年 | 45篇 |
1996年 | 50篇 |
1995年 | 45篇 |
1994年 | 34篇 |
1993年 | 54篇 |
1992年 | 54篇 |
1991年 | 53篇 |
1990年 | 48篇 |
1989年 | 47篇 |
1988年 | 35篇 |
1987年 | 50篇 |
1986年 | 37篇 |
1985年 | 39篇 |
1984年 | 33篇 |
1983年 | 30篇 |
1982年 | 39篇 |
1981年 | 45篇 |
1980年 | 37篇 |
1979年 | 41篇 |
1978年 | 44篇 |
1977年 | 23篇 |
1976年 | 31篇 |
1974年 | 24篇 |
1971年 | 22篇 |
1968年 | 22篇 |
排序方式: 共有4616条查询结果,搜索用时 15 毫秒
111.
112.
Carbohydrate intake during endurance exercise delays the onset of fatigue and improves performance. Two recent cycling studies have reported increased time to exhaustion when protein is ingested together with carbohydrate. The purpose of the present study was to test the hypothesis that ingestion of a carbohydrate + protein beverage will lead to significant improvements in cycling time-trial performance relative to placebo and carbohydrate alone. Thirteen cyclists completed 120 min of constant-load ergometer cycling. Thereafter, participants performed a time-trial in which they completed a set amount of work (7 kJ kg(-1)) as quickly as possible. Participants completed four experimental trials, the first for familiarization and then three randomized, double-blind treatments consisting of a placebo, carbohydrate, and carbohydrate + protein. Participants received 250 ml of beverage every 15 min during the constant-load ride. Time-trial performance for carbohydrate (37.1 min, s = 3.8) was significantly (P < 0.05) faster than placebo (39.7 min, s = 4.6). Time-trial performance for carbohydrate + protein (38.8 min, s = 5.5) was not significantly different from either placebo or carbohydrate. Ingestion of a carbohydrate beverage during two hours of constant-load cycling significantly enhanced subsequent time-trial performance compared with placebo. The carbohydrate + protein beverage provided no additional performance benefit. 相似文献
113.
114.
115.
Traditional approaches to formative evaluation include one-to-one trials which provide some information about revisions that are needed in instructional materials, but typically fail to provide sufficient information about the learner's cognitive processing problems while studying the materials. Read-think-aloud methods are a viable alternative to traditional one-to-ones and provide valuable information about the learner's cognitive processing while reading instructional text. In this paper we describe the read-think-aloud method of formative evaluation and offer suggestions for its use. 相似文献
116.
Howard Carvajal Kathleen Hardy Kathy L. Smith Kenneth A. Weaver 《Psychology in the schools》1988,25(2):129-131
A kindergarten class of 9 boys and 11 girls took the 1986 Stanford-Binet Intelligence Scale (Fourth Edition) and the Wechsler Preschool and Primary Scale of Intelligence. Of 6 correlations of total scores and subtest pairs, only the correlation of total scores was statistically significant (p<.01). 相似文献
117.
118.
119.
120.