2004年荆州市初中数学竞赛(初三)

一、选择题(每小题5分,共30分)1.若n满足(n-2004)2 (2005-n)2=1,则(2005-n)(n-2004)等于().(A)-1(B)0(C)12(D)1图12.如图1,已知∠CGE=120°.则∠A ∠B ∠C ∠D ∠E ∠F=().(A)150°(B)210°(C)240°(D)270°3.设x、y、z均为正实数,且满足zx y相似文献   

二阶方程组特征值边值问题的正解

利用锥上的不动点指数定理研究了一类二阶方程组特征值边值问题正解的存在性,在λ充分小,f与g满足更广泛的条件下得到了两个正解,推广和改进了原有的结果.     

浅谈英语专业二外法语教学

本文介绍了法语的特点及英语专业选择二外法语的原因,针对教学中面临的问题,提出了自己的观点及解决的方法,着重阐述了英法比较的方法。     

试论马克思主义历史决定论的双重属性

马克思主义历史决定论既强调社会历史发展的决定性，又肯定其主体选择性。本在分别阐述其历史决定性和主体选择性的基础上，把二统一在一起，称之为马克思主义历史决定论的双重属性。     

论成人教育发展与国民素质培养

人的良好素质是国民个体成功的基石，国民素质的普遍提高就可以为国家的兴旺发达提供坚实的基础。成人教育不但能帮助成年人补充人生前期教育的缺陷和不足，而且可以帮助劳动者追随社会的发展变化和科学技术进步不断获得新思想、新知识、新技术和新方法，以提高自身的素质和能力。因此，大力发展成人教育，不断拓展它的功能，对于有效开发人力资本，提高我国的国民经济发展水平，推动社会全面进步都有重要的作用和价值。     

Modeling the influences of upper-elementary school students’ digital reading literacy,socioeconomic factors,and self-regulated learning strategies

Background: Reading is an interactive and constructive process of making meaning by engaging a variety of materials and sources and by participating in reading communities at school or in daily life.

Aim: The purpose of this study was to explore the factors affecting digital reading literacy among upper-elementary school students.

Method: A 3-stage stratified cluster sampling was implemented that resulted in a sample of 592 upper-elementary students from 29 classes in 7 schools. Self-Regulated Learning Strategies Assessment (S-RLSA), Digital Reading Literacy Assessment (DRLA), and student reports of their parents’ education backgrounds were used to collect data on the outcome and predictor variables. Interpretation of these data involved two highly regarded statistical techniques. First, structural equation modeling was used to explore relationships amongst the constructs. Second, multi-group invariance (MI) analyses were used to assess the influence of parental education and self-regulated learning strategies on students’ digital reading literacy.

Results: Enriching students’ family learning resources and strengthening their self-regulated learning abilities could have very important influences on promoting upper-elementary school students' digital reading literacy -webpage information retrieval, reading and communication abilities.

Conclusions: This study also provides information on how teachers can address student resources to improve digital reading literacy and self-regulated strategies.     

普通高校女子艺术体操教学实践探索

运用文献资料、数理统计、实验法对女子艺术体操教学进行了实践探索.认为:在女子艺术体操教学中,不同的训练强度与训练内容,对学生身体承受负荷的能力以及身体素质的提高,将产生不同影响.     

Novel high torque bearingless two-sided rotary ultrasonic motor

Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using ex-perimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM.     

教育分化对收入不公平的影响——拉丁美洲研究

1998年世界教育报告尖锐指出，在以知识为基础的社会里，教育已成为拉大社会差距的手段。在我国目前对这一问题的关注与研究还很不够。文章根据美洲开发银行关于1998-1999年拉美经济和社会进步的报告中的有关内容摘写而成。     

集值映象与随机集值映象的几个不动点定理

在本文中我们得到了关于集值映象与随机集值映象的几个新的不动点定理,扩充了[3]中结果,主要结果是定理1—3与定理6—7