全文获取类型
收费全文 | 12058篇 |
免费 | 9篇 |
专业分类
教育 | 9240篇 |
科学研究 | 1248篇 |
各国文化 | 5篇 |
体育 | 449篇 |
文化理论 | 384篇 |
信息传播 | 741篇 |
出版年
2023年 | 7篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 10篇 |
2019年 | 26篇 |
2018年 | 2191篇 |
2017年 | 2103篇 |
2016年 | 1580篇 |
2015年 | 125篇 |
2014年 | 140篇 |
2013年 | 236篇 |
2012年 | 231篇 |
2011年 | 705篇 |
2010年 | 844篇 |
2009年 | 440篇 |
2008年 | 658篇 |
2007年 | 1160篇 |
2006年 | 83篇 |
2005年 | 401篇 |
2004年 | 453篇 |
2003年 | 366篇 |
2002年 | 135篇 |
2001年 | 9篇 |
2000年 | 22篇 |
1999年 | 11篇 |
1998年 | 5篇 |
1997年 | 20篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 14篇 |
1990年 | 13篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1973年 | 5篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1963年 | 1篇 |
1960年 | 1篇 |
1880年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
Peter Wood 《Academic Questions》2017,30(2):245-252
82.
83.
84.
85.
86.
Kirsty Jayne Elliott-Sale Ashley Graham Stephanie Jane Hanley Sherry Blumenthal Craig Sale 《European Journal of Sport Science》2019,19(1):62-70
AbstractMaternal dietary habits influence maternal and foetal health, representing a pathway for intervention to maximise pregnancy outcomes. Advice on energy intake is provided on a trimester basis, with no additional calories required in the first trimester and an additional 340?kcal?d?1 and 452?kcal?d?1 needed for the second and third trimesters. Energy intake depends on pre-gravid body mass index (BMI); underweight women are recommended an increase of 150, 200 and 300?kcal?d?1 during the first, second and third trimester, normal weight women an increase of 0, 350 and 500?kcal?d?1 and obese women an increase of 0, 450 and 350?kcal?day?1. The recommendations for carbohydrate and protein intake are 175?g?d?1 and 0.88–1.1?g?kgBM?d?1, with no change to fat intake. The number of pre-gravid obese women is rising; therefore, we need to regulate weight in women of childbearing age and limit gestational weight gain to within the recommended ranges [overweight women 6.8–11.3?kg and obese women 5.0–9.1?kg]. This can be achieved using nutritional interventions, as dietary changes have been shown to help with gestational weight management. As pregnancy has been identified as a risk factor for the development of obesity, normal weight women should gain 11.5–16.0?kg during pregnancy. While some research has shown that dietary interventions help to regulate gestational weight gain and promote postpartum weight loss to some extent, future research is needed to provide safe and effective guidelines to maximise these effects, while benefitting maternal and foetal health. 相似文献
87.
88.
Jin Woo Lee Anastasia Ostrowski Aileen Huang-Saad Colleen M. Seifert 《European Journal of Engineering Education》2019,44(3):360-378
ABSTRACTWith increasing demand for improved medical equipment and healthcare, next-generation biomedical engineers need strong design skills. Equipping biomedical engineering students with tools for idea generation and development can increase student design success. Design Heuristics are an ideation tool developed through empirical studies of product designs. While identified in the mechanical engineering space, Design Heuristics may be applicable in biomedical engineering design. In our study, we implemented a Design Heuristics session during upper-level undergraduate and first-year graduate biomedical engineering design courses. We examined the applicability of Design Heuristics within individual and team concept generation contexts. The findings demonstrated that biomedical engineering students were able to use Design Heuristics to generate multiple concepts, and that initial concepts produced using Design Heuristics were carried over into final team design. The results support the applicability of Design Heuristics to student idea generation in biomedical engineering design. 相似文献
89.
Donghui Zhang 《Frontiers of Education in China》2018,13(3):448-450
90.