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6.2_2_力和運動

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6.2_2_力的探究

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6.2_2_怎樣的問題怎樣的探究

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6.2_2_科學探究

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6.2_3_四兩撥千斤

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6.2_3_科學與科技-安全篇

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6.2_3_滑輪和齒輪

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6.2_3_簡單機械

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6.2_4_科技新世界

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