全文获取类型
收费全文 | 18294篇 |
免费 | 282篇 |
国内免费 | 55篇 |
专业分类
教育 | 13461篇 |
科学研究 | 1260篇 |
各国文化 | 206篇 |
体育 | 1451篇 |
综合类 | 45篇 |
文化理论 | 142篇 |
信息传播 | 2066篇 |
出版年
2022年 | 120篇 |
2021年 | 245篇 |
2020年 | 329篇 |
2019年 | 497篇 |
2018年 | 679篇 |
2017年 | 702篇 |
2016年 | 660篇 |
2015年 | 419篇 |
2014年 | 562篇 |
2013年 | 3805篇 |
2012年 | 532篇 |
2011年 | 517篇 |
2010年 | 453篇 |
2009年 | 440篇 |
2008年 | 448篇 |
2007年 | 418篇 |
2006年 | 431篇 |
2005年 | 378篇 |
2004年 | 268篇 |
2003年 | 255篇 |
2002年 | 243篇 |
2001年 | 376篇 |
2000年 | 294篇 |
1999年 | 253篇 |
1998年 | 168篇 |
1997年 | 160篇 |
1996年 | 178篇 |
1995年 | 144篇 |
1994年 | 156篇 |
1993年 | 141篇 |
1992年 | 217篇 |
1991年 | 202篇 |
1990年 | 238篇 |
1989年 | 204篇 |
1988年 | 163篇 |
1987年 | 168篇 |
1986年 | 171篇 |
1985年 | 164篇 |
1984年 | 163篇 |
1983年 | 148篇 |
1982年 | 112篇 |
1981年 | 124篇 |
1980年 | 117篇 |
1979年 | 171篇 |
1978年 | 142篇 |
1977年 | 100篇 |
1976年 | 109篇 |
1975年 | 103篇 |
1973年 | 99篇 |
1971年 | 101篇 |
排序方式: 共有10000条查询结果,搜索用时 543 毫秒
131.
132.
Qingli Lei Rose A. Mason Yan Ping Xin John L. Davis Marie David Catharine Lory 《Learning disabilities research & practice》2020,35(4):201-217
This single-case meta-analysis is the first to provide a quantitative synthesis of the published literature on mathematics word problem-solving intervention studies for English learners with learning disabilities and mathematics difficulties. A total of ten single-subject studies were included for analysis. The current study investigated the magnitude of the effect of mathematics interventions targeting the improvement of students’ mathematics word problem-solving performance, and analyzed variables that moderated this effect. Results indicate a moderate overall effect size of 0.81 (95% CI [0.71, 0.90]) on word problem-solving performance for English learners with learning disabilities and mathematics difficulties. Moderator variables such as the implementer of the interventions, instructional focus, and word problem-solving content significantly moderated the mathematics intervention effects. 相似文献
133.
134.
135.
136.
Roy T. H. Cheung Rodney Y. L. Wong Tim K. W. Chung R. T. Choi Wendy W. Y. Leung Diana H. Y. Shek 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(2):238-247
Compared to competitive runners, recreational runners appear to be more prone to injuries, which have been associated with foot strike patterns. Surprisingly, only few studies had examined the foot strike patterns outside laboratories. Therefore, this study compared the foot strike patterns in recreational runners at outdoor tracks with previously reported data. We also investigated the relationship between foot strike pattern, speed, and footwear in this cohort. Among 434 recreational runners analysed, 89.6% of them landed with rearfoot strike (RFS). Only 6.9 and 3.5% landed with midfoot and forefoot, respectively. A significant shift towards non-RFS was observed in our cohort, when compared with previously reported data. When speed increased by 1 m/s, the odds of having forefoot strike and midfoot strike relative to RFS increased by 2.3 times and 2.6 times, respectively. Runners were 9.2 times more likely to run with a forefoot strike in minimalists compared to regular running shoes, although 70% of runners in minimalists continued to use a RFS. These findings suggest that foot strike pattern may differ across running conditions and runners should consider these factors in order to mitigate potential injury. 相似文献
137.
We present a variant of the Game of Pig to introduce the concepts of probability, simulation and expected value. 相似文献
138.
Heather L. Dichter 《国际体育史杂志》2017,34(5-6):335-339
AbstractWhile at first unintentional, the author’s path to becoming a sport historian has incorporated her academic trajectory of sport and German/European history along with working in the sport industry. These experiences have benefited both her scholarly research and her teaching and experiential learning opportunities for students in sport management programs. 相似文献
139.
Amador García-Ramos Belén Feriche Alejandro Pérez-Castilla Paulino Padial Slobodan Jaric 《European Journal of Sport Science》2017,17(6):690-698
This study aimed to explore the strength of the force–velocity (F–V) relationship of lower limb muscles and the reliability of its parameters (maximum force [F0], slope [a], maximum velocity [V0], and maximum power [P0]). Twenty-three men were tested in two different jump types (squat and countermovement jump: SJ and CMJ), performed under two different loading conditions (free weight and Smith machine: Free and Smith) with 0, 17, 30, 45, 60, and 75?kg loads. The maximum and averaged values of F and V were obtained for the F–V relationship modelling. All F–V relationships were strong and linear independently whether observed from the averaged across the participants (r?≥?0.98) or individual data (r?=?0.94–0.98), while their parameters were generally highly reliable (F0 [CV: 4.85%, ICC: 0.87], V0 [CV: 6.10%, ICC: 0.82], a [CV: 10.5%, ICC: 0.81], and P0 [CV: 3.5%, ICC: 0.93]). Both the strength of the F–V relationships and the reliability of their parameters were significantly higher for (1) the CMJ over the SJ, (2) the Free over the Smith loading type, and (3) the maximum over the averaged F and V variables. In conclusion, although the F–V relationships obtained from all the jumps tested were linear and generally highly reliable, the less appropriate choice for testing the F–V relationship could be through the averaged F and V data obtained from the SJ performed either in a Free weight or in a Smith machine. Insubstantial differences exist among the other combinations tested. 相似文献
140.
Elizabeth L. Adams Lesley W. Vandermark J. Luke Pryor Riana R. Pryor Rachel M. VanScoy Craig R. Denegar 《Journal of sports sciences》2017,35(9):828-834
This study examined the separate and combined effects of heat acclimation and hand cooling on post-exercise cooling rates following bouts of exercise in the heat. Seventeen non-heat acclimated (NHA) males (mean ± SE; age, 23 ± 1 y; mass, 75.30 ± 2.27 kg; maximal oxygen consumption [VO2 max], 54.1 ± 1.3 ml·kg?1·min?1) completed 2 heat stress tests (HST) when NHA, then 10 days of heat acclimation, then 2 HST once heat acclimated (HA) in an environmental chamber (40°C; 40%RH). HSTs were 2 60-min bouts of treadmill exercise (45% VO2 max; 2% grade) each followed by 10 min of hand cooling (C) or no cooling (NC). Heat acclimation sessions were 90–240 min of treadmill or stationary bike exercise (60–80% VO2 max). Repeated measures ANOVA with Fishers LSD post hoc (α < 0.05) identified differences. When NHA, C (0.020 ± 0.003°C·min?1) had a greater cooling rate than NC (0.013 ± 0.003°C·min?1) (mean difference [95%CI]; 0.007°C [0.001,0.013], P = 0.035). Once HA, C (0.021 ± 0.002°C·min?1) was similar to NC (0.025 ± 0.002°C·min?1) (0.004°C [?0.003,0.011], P = 0.216). Hand cooling when HA (0.021 ± 0.002°C·min?1) was similar to when NHA (0.020 ± 0.003°C·min?1) (P = 0.77). In conclusion, when NHA, C provided greater cooling rates than NC. Once HA, C and NC provided similar cooling rates. 相似文献