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2．小芳乘超市的自动扶梯匀速下降的过程中小芳的机械能变化情况是 A．动能转化为重力势能机械能不变b．重力势能转化为动能机械能不变c Template






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tomski2．小芳乘超市的自动扶梯匀速下降的过程中小芳的机械能变化情况是 a．动能转化为重力势能机械能不变b．重力势能转化为动能机械能不变c coloring
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