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Watch Later 5:54

S2_科學_9.2c_通用指示劑_pH值

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S2_SCI_9.2b_litmus

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S2_科學_9.2b_石蕊

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S2_科學_9.2a_天然指示劑

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S2_SCI_9.1c_handling acids and alkalis safely

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S2_科學_9.1c_安全地使用酸和鹼

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S2_科學_9.1b_常見的鹼

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S2_科學_9.1a_常見的酸

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S2_SCI_9.1b_common alkalis

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