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Watch Later 15:09

6.2_3_科學與科技-安全篇

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6.2_3_四兩撥千斤

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6.2_2_科學探究

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6.2_2_怎樣的問題怎樣的探究

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6.2_2_力的探究

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6.2_2_力和運動

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6.2_1_能量的轉移

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6.1_5_金牌背後

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