190524燃烧的条件-20160105

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190524-氧化还原反应（说课）-22160819

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190326-时刻和时间间隔-22160707

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190531-燃烧的条件说课-22160823

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190618-静摩擦力-21161022

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190618-静摩擦力-22160732

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190423-力的分解-19160322

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