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化简分数比的技巧
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作者 焦树民 《第二课堂(小学版)》 2002年第5期39-39,共1页
分数比的化简方法,课本上介绍的是运用比的基本性质,把比的前项和后项同时都乘以它们的分母的最小公倍数。如:
关键词 化简分数 简方法 最小公倍数 基本性质 后项 前项 技巧 分母 介绍 课本
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Operation optimization of prefabricated light modular radiant heating system:Thermal resistance analysis and numerical study
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作者 LI Yao HU Ru-kun +4 位作者 XIN Li XUE Jie HUANG Fei XIA Jian-wei YANG Xiao-hu 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第6期1983-1997,共15页
The utilization of prefabricated light modular radiant heating system has demonstrated significant increases in heat transfer efficiency and energy conservation capabilities.Within prefabricated building construction,... The utilization of prefabricated light modular radiant heating system has demonstrated significant increases in heat transfer efficiency and energy conservation capabilities.Within prefabricated building construction,this new heating method presents an opportunity for the development of comprehensive facilities.The parameters for evaluating the effectiveness of such a system are the upper surface layer’s heat flux and temperature.In this paper,thermal resistance analysis calculation based on a simplified model for this unique radiant heating system analysis is presented with the heat transfer mechanism’s evaluation.The results obtained from thermal resistance analysis calculation and numerical simulation indicate that the thermal resistance analysis method is highly accurate with temperature discrepancies ranging from 0.44℃ to−0.44℃ and a heat flux discrepancy of less than 7.54%,which can meet the requirements of practical engineering applications,suggesting a foundation for the prefabricated radiant heating system. 展开更多
关键词 radiant heating system thermal resistance analysis simplified model numerical simulation heat flux temperatur
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巧妙变式 简单解题
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作者 刘杏娜 张丽 《教育实践与研究》 2002年第7期54-55,共2页
把复杂的、繁琐的、条件隐蔽的算式进行恒等变式后,使计算化繁为简.
关键词 分开分数 加减分数 分数 化简分数 小学 数学教学
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