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S2_SCI_9.1b_common alkalis

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S2_SCI_9.1b_common alkalis

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S2_科學_9.1b_常見的鹼

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S2_科學_9.1b_常見的鹼

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F1 最好的老師在家裏

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F1 最好的老師在家裏

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M1Ch.2.1B

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