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普通話複習聲母雙唇音b、p、m唇齒音f舌尖音d、t、n、丨

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Note 2018 - Ch.1-2 (5) Inorganic molecules-Minerals

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Note 2018 - Ch.1-2 (3) Variables in Experiment

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Note 2018 - Ch.1-2 (2) Redi's experiment

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Notes 2018 - Ch.1-2 (1) Seven Characteristics

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