首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   18007篇
  免费   263篇
  国内免费   129篇
教育   12216篇
科学研究   1710篇
各国文化   249篇
体育   2276篇
综合类   22篇
文化理论   192篇
信息传播   1734篇
  2022年   100篇
  2021年   148篇
  2020年   294篇
  2019年   400篇
  2018年   552篇
  2017年   571篇
  2016年   543篇
  2015年   390篇
  2014年   463篇
  2013年   3336篇
  2012年   427篇
  2011年   443篇
  2010年   387篇
  2009年   382篇
  2008年   459篇
  2007年   381篇
  2006年   401篇
  2005年   353篇
  2004年   526篇
  2003年   523篇
  2002年   490篇
  2001年   527篇
  2000年   351篇
  1999年   270篇
  1998年   209篇
  1997年   201篇
  1996年   207篇
  1995年   229篇
  1994年   216篇
  1993年   167篇
  1992年   258篇
  1991年   221篇
  1990年   235篇
  1989年   235篇
  1988年   192篇
  1987年   193篇
  1986年   182篇
  1985年   203篇
  1984年   175篇
  1983年   192篇
  1982年   166篇
  1981年   155篇
  1980年   167篇
  1979年   204篇
  1978年   140篇
  1977年   114篇
  1976年   139篇
  1975年   105篇
  1974年   100篇
  1973年   85篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
111.
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   
112.
Working Graphs     
  相似文献   
113.
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   
114.
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   
115.
116.
对奥运会及我国大型运动会发行体育彩票融资的研究   总被引:1,自引:0,他引:1  
当代大型运动会明显表现出对资金的高需求,但是目前各国中央政府的财政收入不足是各国政府共同面临的普遍问题,这将严重影响政府对大型运动会的投入,而发行体育彩票正是解决这一问题的主要手段之一.笔者就奥运会发行体育彩票的情况和我国举办大型运动会发行体育彩票的情况及存在问题作一论述,并对我国大型运动会通过发行体育彩票的融资提出建议.  相似文献   
117.
118.
Information specialists should provide a value-added service by supplementing their online searches with primary research. Primary research results in more up-to-date information from a broader spectrum of sources. The requester benefits from primary research by receiving a cost-effective and more comprehensive information package. The information professional benefits by acquiring a more in-depth knowledge of the subject, increasing awareness of important projects within the organization, and achieving recognition as a key information analyst.  相似文献   
119.
Successful hospital and corporate libraries offer customized resources and services to meet the needs of their dynamic organizations. Concepts such as customer-driven, service-oriented and value-added are central to these libraries. Serving decision makers and integrating the library into the decision-making process of the organization is critical. Future articles in this new column will further explore the underlying philosophies and the specialized resources and services that characterize these libraries.  相似文献   
120.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号