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物质的性质与转化ppt Free Resources Download
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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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"Material Changes and Us" Material Changes PPT Courseware 2
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"Material Changes and Us" Material Changes PPT Courseware 4
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"Diversity of Iron" PPT courseware on the properties and transformation of matter (the transformation relationship between iron and its compounds in Lesson 3)
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"Classification and Transformation of Matter" Matter and its Changes PPT (Classification of Matter in Lesson 1)
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"Material Changes and Us" Material Changes PPT Courseware 3
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