190329-速度：平均速度，瞬时速度-22160731

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190325-因特网信息的查找-22161905

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190326-路程和位移、矢量和标量-22160713

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190614-氧化还原反应-22160841

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190419-物质的量-22160819

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190423-动能和动能定理-21160930

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190524-物质的量-15160421

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190614-燃烧的条件说课-09160310

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190326-速度-07160211

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