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Watch Later 3:24

F.2 Science_Chapter 8_Current_P.86

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F.2 Science_Chapter 8_Circuit symbol_P.81

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F.2 Science_Chapter 8_Closed circuit_P.77

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F.2 科學_第八課_電路符號_P.81

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F.2 科學_第八課_完整電路_P.77

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F.1 Ch 2.1.2 (3)

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F.1 Ch 2.1.2 (2)

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F.1 Ch 2.1.2 (1)

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F.1 Ch 2.1.1 (2)

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