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"Transformation of Matter" PPT (Lesson 3)
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"Chemical Reactions and Energy Transformation" Chemical Bonding and Chemical Reaction Laws PPT (Lesson 2)
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"Kinetic Energy" Mechanical Energy and Its Transformation PPT Courseware
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"Conversion of Sulfur" Nature and Transformation of Substances PPT (Lesson 2: Sulfuric Acid Rain and Its Prevention and Control)
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