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《質量守恆定律》化學變化及其表示PPT課件2 Free Resources Download
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"Vaporization and Liquefaction" PPT courseware on changes in the state of matter (Lesson 2: Liquefaction)
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"Physical Quantities Commonly Used in Chemistry—Amount of Substances" Understanding Chemical Science PPT Courseware (Lesson 3: Amount and Concentration of Substances)
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"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 2)
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"The Terrain of the Earth's Surface" The Earth's Surface and Its Changes PPT Courseware 3
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"Iron is Rusty" PPT teaching courseware on changes in matter
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