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化学变化及其表示PPT Free Resources Download
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"Representation of Material Composition—Chemical Formula" Representation of Chemical Elements and Material Composition PPT Courseware 2
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"Melting and Solidification" PPT courseware on physical states and their changes
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"Redox Reaction" Substances and their Changes PPT (Lesson 1 Redox Reaction)
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"What's in the Soil" Earth's Surface and Its Changes PPT Courseware 2
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