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正一、问题的缘起变式练习的教学当下已然成为倍受关注的一种教学方法,它是指在新课改理念的指导下,以情感、态度和价值观的三维目标为导向,有目的、有计划地在数学概念的教学中不断变换数学概念中的非本质特征,加强学生透过现象看清事物本质的能力。教师通过变式练习把规律性的问题联系在一起,不仅对题型做出归纳总结,也对解题方法进行了筛选归类。避免盲目的"题海"战术,使学生乐学、勤学、善学,在为学生减负的同时也能够真正提高课堂教学的有效性。 相似文献
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Aternative.nonacademic(?)The notion that only a college education canassure a good future may be losing credence.High-school students are encouraged to go to college toexpand their career opportunities,but Northwestern Uni-versity professor lames Rosenbaum finds that high schoolscan prepare students for the workplace by emphasizingdifferent skills and expanding goal choices.“By ignoring goals beside college,ignoring softskills,and ignoring long-term incentives,policy on theschool-to-work transition for American youths misleadsthem about societal needs and payoffs,”he writes in hispook Beyond College for All. 相似文献
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Science, medicine, and education will get aboost,says a former astronaut. A board the International Space Station,astro—nauts,cosmonauts,and scientists from around the globeare collaborating1 on science that once was thought only to befiction2.With new scientific tools at their fingertips,space sta-tion crews are working in many areas,including materials sci-ence,medicine,and Earth observation. 相似文献
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As animal species become extinct1 and ecosys-tems less diverse,the environment for re-maining species will become less healthy,ac-cording to a University of Marylandstudy.Biology professor Margaret Palmer and doc-toral student Bradley Cardinale found that severaldifferent species of caddis fly larvae2 living togetherin a given stream means greater food productivitythan when only one species is present. 相似文献
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为了实现汽油干点的直接在线测量,提出了一种基于T-S模糊神经网络(TS-FNN)的汽油干点预测方法.以某炼油厂常减压装置常压塔塔顶汽油干点为背景,确定影响因素,分析采集的数据,依据样本数据建立BP神经网络(BPNN)模型及TS-FNN模型,验证模型的预测有效性.结果表明:基于TS-FNN模型预测的汽油干点与观测值基本一... 相似文献
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Aworkplace that will know who you are, where you are and what you're doing. Even five years ago, it was impossible to predict the spread of such technologies as Wi-Fi, which allows workers to become office nomads, yet always connected to e-mail and crucial corporate data. The technology has proved so popular, it's a key force in reshaping the topography of the office. So what will the workplace actually look like five years from now, when such tools are ubiquitous and new 相似文献
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