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   45804篇
  免费   821篇
  国内免费   1115篇
教育   29692篇
科学研究   7344篇
各国文化   36篇
体育   4315篇
综合类   2827篇
文化理论   68篇
信息传播   3458篇
  2024年   24篇
  2023年   136篇
  2022年   635篇
  2021年   1033篇
  2020年   1272篇
  2019年   1011篇
  2018年   892篇
  2017年   839篇
  2016年   996篇
  2015年   1362篇
  2014年   3338篇
  2013年   4153篇
  2012年   4439篇
  2011年   4377篇
  2010年   2886篇
  2009年   2729篇
  2008年   2735篇
  2007年   3094篇
  2006年   2892篇
  2005年   2331篇
  2004年   1934篇
  2003年   1488篇
  2002年   1085篇
  2001年   755篇
  2000年   465篇
  1999年   210篇
  1998年   151篇
  1997年   105篇
  1996年   73篇
  1995年   51篇
  1994年   57篇
  1993年   55篇
  1992年   37篇
  1991年   32篇
  1990年   13篇
  1989年   30篇
  1988年   4篇
  1985年   2篇
  1983年   1篇
  1979年   2篇
  1978年   4篇
  1977年   1篇
  1976年   2篇
  1957年   9篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
941.
通识教育:美国与中国   总被引:5,自引:0,他引:5  
本文是甘阳教授2007年6月14日在复旦大学演讲的整理稿,演讲以美国大学的通识教育为参照,讨论了中国大学推进通识教育的一些重要原则问题,提出了通识教育课程改革的若干意见.  相似文献   
942.
Brix weight per stool (BW) of sugarcane is a complex trait, which is the final product of a combination of many components. Diallel cross experiments were conducted during a period of two years for BW and its five component traits, including stalk diameter (SD), stalk length (SL), stalk number (SN), stalk weight (SW), and brix scale (BS) of sugarcane. Phenotypic data of all the six traits were analyzed by mixed linear model and their phenotype variances were portioned into additive (A),dominance (D), additive×environment interaction (AE) and dominance×environment interaction (DE) effects, and the correlations of A, D, AE and DE effects between BW and its components were estimated. Conditional analysis was employed to investigate the contribution of the components traits to the variances of A, D, AE and DE effects of BW. It was observed that the heritabilities of BW were significantly attributed to A, D and DE by 23.9%, 30.9% and 28.5%, respectively. The variance of A effect for BW was significantly affected by SL, SN and BS by 25.3%, 93.7% and 17.4%, respectively. The variances of D and DE effects for BW were also significantly influenced by all the five components by 5.1%~85.5%. These determinants might be helpful in sugarcane breeding and provide valuable information for multiple-trait improvement of BW.  相似文献   
943.
在一般的IDS中存在着很高的漏报和误报率.从一般入侵检测的原理出发,分析了产生漏报和误报的主要原因,并提出了相应改进方法.  相似文献   
944.
新课程背景下教师如何备好学生   总被引:1,自引:0,他引:1  
新课程背景下教师的备课首先必须备好学生.备好学生应做到六个了解,遵循三个原则,掌握五种基本方法,这样才能真正实现"一切为了学生的发展"的素质教育目标,才能更好地作出适合学生发展的课堂教学设计,才能更好地引导和组织学生进行有效课堂教学活动.  相似文献   
945.
论新课程改革的"软着陆"   总被引:4,自引:0,他引:4  
查有梁 《教育学报》2007,3(2):16-23
新课程改革需要"软着陆",是指课改的进程要减慢速度,课改的实施要稳步成功.钟启泉教授的一篇对新课程改革的总结性《对话》提出的一系列观点,都不利于课程改革的"软着陆",是对课程改革的误导.这些误导表现出了西方后现代理论在中国课程改革中的一种思潮.新课程改革如何"软着陆",这需要以"科学发展观"为指导.  相似文献   
946.
Quantitative trait loci (QTL) analysis was conducted in bread wheat for 14 important traits utilizing data from four different mapping populations involving different approaches of QTL analysis. Analysis for grain protein content (GPC) sug- gested that the major part of genetic variation for this trait is due to environmental interactions. In contrast, pre-harvest sprouting tolerance (PHST) was controlled mainly by main effect QTL (M-QTL) with very little genetic variation due to environmental interactions; a major QTL for PHST was detected on chromosome arm 3AL. For grain weight, one QTL each was detected on chromosome arms 1AS, 2BS and 7AS. QTL for 4 growth related traits taken together detected by different methods ranged from 37 to 40; nine QTL that were detected by single-locus as well as two-locus analyses were all M-QTL. Similarly, single-locus and two-locus QTL analyses for seven yield and yield contributing traits in two populations respectively allowed detection of 25 and 50 QTL by composite interval mapping (CIM), 16 and 25 QTL by multiple-trait composite interval mapping (MCIM) and 38 and 37 QTL by two-locus analyses. These studies should prove useful in QTL cloning and wheat improvement through marker aided selection.  相似文献   
947.
加强会计职业道德建设的途径和方法   总被引:1,自引:0,他引:1  
阐述了会计职业道德及其建设的重要性,指出了当前会计职业道德的现状并分析了存在问题的原因,提出了加强会计职业道德建设的途径与方法.  相似文献   
948.
词语作为文本信息的载体,使得译者对词语意义的准确把握成为翻译的基础和前提。词义的复杂性又使得译者不得不对原语词语和译语词语进行语义成分分析。翻译中的语义成分分析可以使译者在翻译过程中准确地把握原语词语,从而避免误译。  相似文献   
949.
"上"用在动词后,可以表示趋向义,也可表示继续义.不同义"V上"的差别主要体现在以下几方面后接宾语、能否扩展、能否拆开、"V上"中的"上"能否用"下、起来"等替换.  相似文献   
950.
By using recruitment data from 60 German departments of business administration, networks are constructed in which the nodes are departments, and two departments are connected if they have either sent or received a scientist from one another. Different concepts of social network analysis are applied to answer a series of questions, such as the number of scientists the business departments produce, to whom they send and from whom they receive their scientists, and which role academic networks play in the career of young scientists in business administration. Regression analysis revealed that network centrality is a robust predictor of departmental reputation. The social network approach can be used to assess reputational differences among business departments, thereby providing an alternative to existing opinion surveys and research rankings.
Heinke RoebkenEmail:
  相似文献   
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