190329-氧化还原反应-08160160

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190524-化学反应限度-92181660

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190614-元素周期律（说课）-22160827

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190621-氧化还原反应说课-92181660

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190326-时刻和时间间隔-22160707

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190326质点机械运动07160128

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190423-力的合成-22160735

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