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长方体棱长与表面积演示器
Demonstsatos for showing the edge Liness and the area of the cuboid
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炼钢转炉模型技术条件
Technical specifications for the model of steelification converter
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炼铁高炉模型技术条件
Technical specifications for the model of iron - smelting blast furnace
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氨合成塔模型技术条件
Technical specifications for the model of the ammonia synthetic column
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硫酸接触室模型技术条件
Technical specifications for the model of reaction chamber for sulphuric aid production
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沸腾焙烧炉模型技术条件
Technical specifications for the model of boiling - roaster
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牛顿环
Newton's rings
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教学仪器 力学、热学仪器运输、贮存环境条件和试验方法
Environment specification of tronsterence tore and tert for the mechanics heat teaching instrumentr
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幼儿计算卡片
Compuoting cards for children
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