全文获取类型
收费全文 | 31890篇 |
免费 | 377篇 |
国内免费 | 136篇 |
专业分类
教育 | 21953篇 |
科学研究 | 2969篇 |
各国文化 | 336篇 |
体育 | 3650篇 |
综合类 | 26篇 |
文化理论 | 270篇 |
信息传播 | 3199篇 |
出版年
2021年 | 294篇 |
2020年 | 479篇 |
2019年 | 693篇 |
2018年 | 950篇 |
2017年 | 889篇 |
2016年 | 889篇 |
2015年 | 551篇 |
2014年 | 729篇 |
2013年 | 5560篇 |
2012年 | 660篇 |
2011年 | 710篇 |
2010年 | 557篇 |
2009年 | 615篇 |
2008年 | 630篇 |
2007年 | 588篇 |
2006年 | 590篇 |
2005年 | 504篇 |
2004年 | 738篇 |
2003年 | 632篇 |
2002年 | 639篇 |
2001年 | 805篇 |
2000年 | 684篇 |
1999年 | 567篇 |
1998年 | 355篇 |
1997年 | 333篇 |
1996年 | 385篇 |
1995年 | 334篇 |
1994年 | 338篇 |
1993年 | 285篇 |
1992年 | 474篇 |
1991年 | 463篇 |
1990年 | 448篇 |
1989年 | 478篇 |
1988年 | 419篇 |
1987年 | 411篇 |
1986年 | 414篇 |
1985年 | 470篇 |
1984年 | 381篇 |
1983年 | 397篇 |
1982年 | 324篇 |
1981年 | 313篇 |
1980年 | 331篇 |
1979年 | 451篇 |
1978年 | 329篇 |
1977年 | 298篇 |
1976年 | 271篇 |
1975年 | 236篇 |
1974年 | 238篇 |
1973年 | 227篇 |
1971年 | 226篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
依据现代跳技术的主要特点与发展趋势,结合大学生跳远运动员绝对速度水平相对较低,助跑准确性与稳定性不高的实际情况,对普通高校高水平跳远运动员训练的方法学中的训练指导思想、训练状态目标、训练系统调控方法,一般训练与专项训练的关系、专项素质和专项技术特征及其训练手段等六个主要问题做了尝试性的探讨。 相似文献
52.
孙汉超 《体育成人教育学刊》2002,18(4):11-13
因学习《星光为何这般灿烂?》一的启发,深入研究中国乒乓球队科学管理的经验,提出以为本、系统理念、乒乓化、创新出效、竞争求胜等规律。 相似文献
53.
The emerging political consciousness of the Russian people isanalyzed against a background of severe constraints in the Sovietera on public opinion formation. Problems in the transitionto democracy and representative government are reflected inheightened interest in politics, volatile levels of confidencein key political institutions, and deep uncertainty about thefuture in both economic and political terms. 相似文献
54.
An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay. 相似文献
55.
赛艇运动的项目特性及训练指导思想 总被引:13,自引:4,他引:9
通过对赛艇运动项目决定成绩的因素,如供能系统、专项素质、生理特性的分析,确定了赛艇运动的特性及规律,并据此特性科学地提出了该项目的训练指导思想. 相似文献
56.
57.
How will the expansion of the concept of construct validity affect validation practice in employment testing? How does the need for consequential validity differ in educational and employment testing? How do the research bases differ for performance assessment in these settings? Are there parallel trends in policies for test use in education and industry? 相似文献
58.
59.
Characteristics of early adopters of end-user online searching in the health professions 总被引:1,自引:0,他引:1
J G Marshall 《Bulletin of the Medical Library Association》1989,77(1):48-55
This paper examines end-user, online searching using data from a questionnaire mailed to 150 Canadian health professionals in practice settings. The response rate was 83% (n = 124). The data provide a demographic profile of early adopters of end-user searching in the health care community. Positive correlations with the user's level of implementation of end-user searching were found for the following variables: amount of time spent in research activities, amount of system training received, and use of Medical Subject Headings (MeSH). There was a negative association between the amount of time spent in patient care and implementation level. General practitioners and family physicians had lower implementation levels than physicians in other specialties. Successful implementers were more likely to be computer literate and to place a high value on formal information sources such as books, journals, and libraries. Health professionals using so-called "user-friendly" or menu-based software had lower levels of personal commitment to using online databases, as measured by a combination of continuance of use, willingness to pay personally, type of recommendations made to colleagues, and hardware ownership. 相似文献
60.