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适用范围:初中各年级.教学耳的:(1)通过图形的折折、剪剪、拼拼,培养学生的动手能力.(2)通过学生的数学活动,渗透全等、对称、旋转等数学概念及运动变化的数学思想方法,渗透数学美.(3)培养学生的探究能力,训练学生的创 相似文献
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王亚权 《中国数学教育(高中版)》2014,(23)
课堂上教师总是将最简洁的方法呈现给学生,作业中学生总会出现这样或那样“走弯路”的现象,教师的简洁解法与学生的“走弯路”现象之间到底隔着什么?通过还原一道习题解答的心理历程和组织相应的课堂教学,我们认为课堂教学应该更多地吸引学生的注意,应该把握好能省略的和不能省略的环节,需要保持一种原生态,应该允许学生“走弯路”. 相似文献
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分层次教学的意义 义务教育的实施,使原来一部分双差生也升入了初中。这样,在同一个班级里,学生的知识、能力参差不齐,学习水平距离拉大,后进生比例明显上升。如何使这些学生留得住、有所学,成了学校教育、教学的一大难题。显然,传统的一刀切的教学模式,已不能适应 相似文献
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《四季》是由柴科夫斯基创作的钢琴套曲,深受人们的喜爱,是一部极具研究价值的经典之作。这部作品注重音乐内容,并从地域以及人文等方面为听众营造出精美的音乐画面。本文也对柴科夫斯基《四季》钢琴套曲进行了详细研究,可以为大家提供参考建议,同时也可以为钢琴演奏人员在演奏《四季》时提供一些帮助。 相似文献
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问题:如图1所示,l是一直线形的河流,一牧童在A处放牧.(1)若牧童要牵马到河边饮水,请在图中画出最短的路线;(2)若B为牧童的家,牧童牵马饮水后即刻回家,要使牧童牵马饮水及回家所走路程最短,牧童应走怎样的路线?请在图中画出,并说明理由. 相似文献
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王亚权 《中国数学教育(高中版)》2012,(Z1)
中考第一轮复习具有学生对知识的遗忘率高、存储的知识零散、学习策略水平差异大、介于单元复习与中考第二、三轮复习之间等特点.因此,"以课本为载体,夯实基础"是我们需要坚持的第一复习原则;保护学生的复习热情,让他们始终怀有一份期待,鼓励学生积极深度地参与复习活动是我们需要坚持的第一复习策略.提高复习效率的关键是研究学生.研究学生的重点在于关注学生的数学现实、关注学生的课堂学习、关注学生的作业质量、关注学生提出的问题. 相似文献
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Titanium silicalite-1(TS-1)was synthesized by a hydrothermal synthesis method with different amounts of tetrapropyl ammonium hydroxide(TPAOH)as template. The as-prepared TS-1 was characterized by scanning electron microscopy, X-ray powder diffraction, Fourier-transform infrared resonance spectroscopy, ultravioletvisible diffuse reflectance spectroscopy and nitrogen physical adsorption and desorption, and studied in the propylene epoxidation with hydrogen peroxide in a fixed bed reactor. The results showed that the amount of TPAOH had a strong influence on the grain morphology, the amount of framework Ti, and the average particle sizes of TS-1. With the increase of TPAOH amount in the synthesis(the molar ratio of TPAOH/SiO2 increasing from 0.25 to 0.45), the morphology changed gradually from ellipsoids to cubes, the particle sizes of TS-1 decreased slightly, the amount of the framework Ti increased appreciably, and the catalytic stability in the propylene epoxidation increased markedly. Moreover, all the catalysts had the same selectivity to propylene epoxide. However, when the molar ratio of TPAOH/SiO2 was further increased to 0.55, the particles became large hexagons with the size distribution in a wide range, and the catalytic stability decreased sharply although the amount of the framework Ti increased further, which can be attributed to the long diffusion paths of the reactants in the zeolite. 相似文献
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职业技术学院化学实验教学工作的几点思考 总被引：2，自引：0，他引：2
我国经济自改革开放以来一直保持快速稳定的发展势头,但现阶段我国经济发展正面临着一个重要问题,即产业结构优化升级需要更多的高级技术工人。这对高等职业技术教育来说是一次机遇,也是一次挑战。就目前职业技术学院化学实验教学的现况,以及在化学实验教学中尝试进行项目式培养模式方面进行了阐述和初步探讨。 相似文献
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The extractive reaction process of oxygen-working solution-water three-phase system for the production of hydrogen peroxide by the anthraquinone method was investigated in a sieve plate column of 50 mm in internal diameter. The oxidation reaction of anthrahydroquinone in the working solution with oxygen and the extraction of hydrogen peroxide from the working solution into aqueous phase occurred simultaneously in the countercurrent mode. The agitating effect caused by gaseous phase made the droplets of the dispersed phase become smaller, thus, increasing the liquid-liquid interfacial contact areas and resulting in the improvement of the mass transfer velocity. Results showed that the gas-agitation had a beneficial effect on the extraction of hydrogen peroxide from the working solution into the aqueous phase： the concentration of hydrogen peroxide in the raffinate decreased with the increase of the gaseous superficial velocities： and the concentration of H2O2 in the raffinate increased with the increase of the dispersed phase superficial velocity at the same superficial velocity of the gaseous phase. In the G-L-L extractive reaction process, with the increase of the gaseous superficial velocities, both the conversion of the anthrahydroquinone oxidation and the extraction efficiency of hydrogen peroxide first increased significantly, then increased gradually. 相似文献