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纵观这几年中考试题的走向,已经由单纯的知识叠加型转化为知识、方法和能力综合型,尤其加强了创新能力型试题,为数学教学方法提出了新的思考,即如何在教学中加入“媒介物”,以使学生将抽象的概念和实践意义进行有机结合,而“概念图”就是这样的一种“媒介物”. 相似文献
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As it is known, track transportation can be divided into track system above and track system below. While the train is moving, the parts above and below are interacted and influenced. Therefore, in fact, the problem of track transportation is the match between the vehicle and the railway line system. In this paper, on a basis of dynamic analysis of the vehicle-subgrade model of vertical coupled system under primary suspension, utilizing track maintenance standard and simulating track irregularity excitation, the dynamic interaction of vehicle-track-subgrade system is researched in theory and dynamic model of the vertical vehicle-track-subgrade coupled system under secondary suspension is established by compatibility condition of deformation. Even this model considers the actual structure of a vehicle, also considers vibration characteristic of the substructure of track including subgrade and foundation. All these work want to be benefit for understanding and design about the dynamic characters of subgrade in high speed railway. 相似文献
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直至19世纪末期,物理学家一般还是相信光是一种波,因此,大家认为它必须藉由某种媒介物才能前进,正如声波是在空气中振动一样。科学家几世纪以来一直都相信,宇宙间充满着一种闪亮、神秘、幽灵似的物质,叫做以太,是光波的媒介物。许多科学家都试图欲探测出以太,但无人成功。最后,Albert Michelson和Edward Morley于1887年做了有名的实验,提供强而有力的证据, 相似文献
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