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   25515篇
  免费   357篇
  国内免费   14篇
教育   18428篇
科学研究   1944篇
各国文化   269篇
体育   2515篇
综合类   10篇
文化理论   216篇
信息传播   2504篇
  2021年   239篇
  2020年   368篇
  2019年   555篇
  2018年   762篇
  2017年   707篇
  2016年   691篇
  2015年   434篇
  2014年   603篇
  2013年   4742篇
  2012年   557篇
  2011年   611篇
  2010年   483篇
  2009年   526篇
  2008年   514篇
  2007年   492篇
  2006年   479篇
  2005年   382篇
  2004年   401篇
  2003年   318篇
  2002年   339篇
  2001年   468篇
  2000年   531篇
  1999年   451篇
  1998年   275篇
  1997年   272篇
  1996年   344篇
  1995年   324篇
  1994年   306篇
  1993年   264篇
  1992年   411篇
  1991年   418篇
  1990年   380篇
  1989年   383篇
  1988年   345篇
  1987年   331篇
  1986年   330篇
  1985年   377篇
  1984年   305篇
  1983年   310篇
  1982年   249篇
  1981年   254篇
  1980年   279篇
  1979年   400篇
  1978年   294篇
  1977年   279篇
  1976年   221篇
  1975年   198篇
  1974年   204篇
  1973年   184篇
  1971年   178篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
63.
The most frequently requested accommodation among students with learning disabilities (LD) in postsecondary settings is extended test time. The frequency with which this accommodation is requested and granted compels disability service providers to become knowledgeable about the factors that influence the need for, and appropriateness of, the accommodation. Moreover, the synthesis of these factors becomes the basis for determining if the accommodation is reasonable under federal law. The purpose of this article is to present a step‐by‐step model to be used as a decision‐making process when considering the accommodation of extended test time for postsecondary students with LD. The model is designed to assist disability service providers in the analysis and synthesis of information collected from (1) the student's diagnostic evaluation, (2) the course or classroom test to be accommodated, and (3) student interviews. A list of diagnostic tests from the four most frequently administered test batteries used with adults is provided, along with a concise explanation of how characteristics of LD impact reading, writing, and math, and relate to the need for extended time. This information can be used to determine if extended test time is a reasonable accommodation and to estimate how much additional time to provide.  相似文献   
64.
为了解江西农村居民开展武术活动的情况,为江西全民健身提供指导,通过问卷调查,文献资料,专家访谈等方法,对江西农村居民的武术观念、习武行为和制约因素及发展趋势进行研究,针对以上现状提出江西农村居民参加活动的发展建议。  相似文献   
65.
66.
67.
68.
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   
69.
70.
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