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物質及其變化ppt Free Resources Download
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"Law of Conservation of Mass" Chemical Changes and Their Representation PPT Courseware 2
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"Oxidation-Reduction Reaction" Substances and Their Changes PPT (Lesson 2 Oxidizing Agents and Reducing Agents)
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"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 2
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"Material Around Us" Material Changes PPT Courseware 3
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"Classification of Substances" Classification and transformation of substances PPT courseware
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