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登入朗文出版社(英文音樂電腦)程序

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6.2_5_科技與生活

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6.2_4_科學與科技的發展(二)

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6.2_4_科學與科技的發展(一)

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6.2_4_科技新世界

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6.2_3_簡單機械

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6.2_3_滑輪和齒輪

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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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