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Watch Later 5:54

S2_科學_9.2c_通用指示劑_pH值

Watch Later 4:22

S2_SCI_9.2b_litmus

Watch Later 3:56

S2_科學_9.2b_石蕊

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S2_科學_9.2a_天然指示劑

Watch Later 3:45

S2_SCI_9.1c_handling acids and alkalis safely

Watch Later 3:26

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

Watch Later 1:32

S2_科學_9.1a_常見的酸

Watch Later 1:50

S2_SCI_9.1b_common alkalis

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