全文获取类型
收费全文 | 10516篇 |
免费 | 248篇 |
国内免费 | 902篇 |
专业分类
教育 | 7104篇 |
科学研究 | 2950篇 |
各国文化 | 7篇 |
体育 | 325篇 |
综合类 | 497篇 |
文化理论 | 12篇 |
信息传播 | 771篇 |
出版年
2024年 | 5篇 |
2023年 | 44篇 |
2022年 | 124篇 |
2021年 | 232篇 |
2020年 | 278篇 |
2019年 | 182篇 |
2018年 | 172篇 |
2017年 | 188篇 |
2016年 | 214篇 |
2015年 | 254篇 |
2014年 | 1103篇 |
2013年 | 1064篇 |
2012年 | 866篇 |
2011年 | 1131篇 |
2010年 | 923篇 |
2009年 | 796篇 |
2008年 | 806篇 |
2007年 | 583篇 |
2006年 | 595篇 |
2005年 | 496篇 |
2004年 | 383篇 |
2003年 | 370篇 |
2002年 | 283篇 |
2001年 | 214篇 |
2000年 | 143篇 |
1999年 | 64篇 |
1998年 | 35篇 |
1997年 | 26篇 |
1996年 | 21篇 |
1995年 | 28篇 |
1994年 | 16篇 |
1993年 | 9篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
我国报业集团化发展至今已经9个年头,报业集团的数量也已增加到目前的41家。由于报业的集团化之路缺乏必要的企业化铺垫,都或多或少地受到政治力量的推动,因此,在一定时段内各子报子刊会存在貌合神离、各自为战的现象,很可能导致“内耗”,造成“规模不经济”。因此,只有将子报子刊的资源有效整合,才能弥补报业集团浮躁发展带来的危险,才能真正实现经济学意义上的“规模经济”。 相似文献
92.
Bart Rienties Bas Giesbers Simon Lygo-Baker Hoi Wah Serena Ma Roger Rees 《Interactive Learning Environments》2016,24(3):539-552
After a decade of virtual learning environments (VLEs) in higher education, many teachers still use only a minimum of its affordances. This study looked at how academic staff interacted with a new and unknown VLE in order to understand how technology acceptance and support materials influence (perceived and actual) task performance. In an experimental design, 36 participants were split into a control (online help) and experimental (instructor video) condition and completed five common teaching tasks in a new VLE. In contrast to most technology acceptance model research, this study found that perceived usefulness of the VLE was not related to (perceived) task performance. Perceived ease of use was related to intentions and actual behaviour in the VLE. Furthermore, no significant difference was found between the two conditions, although the experimental condition led to a (marginal) increase in time to complete the tasks. 相似文献
93.
外语教师在课堂上运用非语言交际能活跃课堂,达到理想的教学效果,本文阐述了外语教师如何在课堂上运用体态语,副语言、客体语和环境语进行教学的方法。 相似文献
94.
A new site-specific nutrient management approach was developed to break the apparent attainable yield barrier of 6 t·ha−1 in the double rice cropping system of Zhejiang. On-farm experiments involving 21 rice-growing farmer families and NPK long-term
experiments commenced in 1997 in the central part of Zhejiang Province to assess the status of soil fertility and productivity
under intensive rice-rice cropping. A new site-specific nutrient management (SSNM) approach has been developed for this studied
area. Field-specific fertilizer recommendations are calculated considering indigenous nutrient supply, reasonable grain yield
targets and corresponding nutrient demand, nutrient balance and nutrient use efficiency, as well as socio-economic factors.
The agronomic performance of SSNM was tested against the farmer's fertilizer practice (FFP) in four 1998–1999 cropping seasons.
Across seasons and years, SSNM consistently increased plant nutrient uptake, grain yield and profit by about 10%–15% compared
to the FFP. Yield levels of 7.5 t·ha−1 or more seem achievable and sustainable through introduction of SSNM and improved extension services in Zhejiang Province.
Project supported by the International Fertilizer Industry Association(IFA), the Potash and Phosphate Institute, Canada (PPIC),
and International Potash Institute(IPI). 相似文献
95.
Objective: We aim to describe the environment iodine concentration in salt, water and soil along Zhejiang Province coast in the China foreland. It will be helpful for us to judge whether this area is insufficient in iodine and universal iodized salt is necessary or not. Methods: We collected iodized salt samples, drinking water samples (tap water in the towns, and well water or spring water in the villages), water samples from different sources (ditches, lakes, rivers) and soil samples through random sampling in June, 2005. Salt, water and soil iodine was detected by arsenic-cerium redox method. Statistical analysis was expressed as mean±SEMby Windows SPSS 13.0. Results: (1) The iodine concentration in salt was 27.9±4.33 mg/kg (n=108). (2) Seventy-five water samples were collected. The water iodine value was 0.6~84.8 μg/L (mean of 11.66 μg/L). The watershed along the Qiantang River has significantly higher iodine content than the water in Lin'an in mountain area (P<0.01). The iodine content and mean iodine content of tap water, well or spring water and natural water sources were 4.30±2.43 μg/L (n=34), 23.59±27.74 μg/L (n=19)and 12.72±10.72 μg/L (n=22) respectively. This indicated that among environmental water sources, the ditch iodine content was the highest with river water iodine being the lowest (P<0.01). (3) Soil iodine value was 0.11~2.93 mg/kg (mean of 1.32 mg/kg).Though there was no statistical difference of soil iodine in different districts (P=0.131), soil iodine content correlated positively with water iodine content. Conclusion: Iodine concentration in salt accords with national policy of adding iodine in salt. Foreland has more iodine in water than mountain area. The data reflected that water and soil iodine in foreland area was not high, which suggests universal iodized salt should be necessary. Environment iodine has relatively close association with pollution. 相似文献
96.
近年来我国房地产业出现了快速发展的过热现象,其原因复杂。2004年中央开始有针对性地对房地产行业进行宏观调控,但过去的和现有的政策只具有明显的短期效应。因此,各级政府必须从房地产行业目前的机制与现存的问题出发,建立与市场经济相适应的房地产业宏观调控的长效机制,真正使房地产业长期稳定健康的发展。 相似文献
97.
王琪 《咸阳师范学院学报》2002,17(3):34-36
古汉语教材普遍把因果复句中表示原因的非名词性谓语句称判断句的活用,认为判断句活用的标准首选要根据判断的本质特征,-谓语性质是名词性的,其次须参考判断句的表现形式和逻辑关系。 相似文献
98.
侯克鹏 《湖南广播电视大学学报》2011,(3):80-84
假冒注册商标罪是我国知识产权刑事保护体系中的重要罪名。随着我国市场经济的快速发展,知识产权领域的犯罪日渐增多,其中通过假冒他人注册商标进行犯罪的现象尤为突出。为了在司法实践中正确区分罪与非罪,应当注意从“同一种商品”、“相同商标”、“使用”、“情节严重”等多个方面厘清假冒注册商标罪的认定标准。 相似文献
99.
100.
Non-verbal communication is a necessary and an important approach when we communicate with others. Teaching is also a kind of communications between teachers and students. So, non-verbal behaviors that teachers adopt during class are very useful, especially to teach pupils English. This paper is based on this and discusses different non-verbal behaviors in the pupils’ English class. 相似文献