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物质的变化和性质ppt Free Resources Download
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"The Mass of Objects and Its Measurement" PPT courseware on the scale, mass and density of the material world
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"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Their Changes PPT Courseware
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"Transformation of Sulfur" Properties and Transformation of Matter PPT (Sulfur Dioxide in Nature in the First Lesson)
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"Controlling the Speed of Iron Rusting" Changes in Matter PPT Download
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"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Their Changes PPT Courseware 2
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