如图2所示一个人稳站在商店的自动扶梯的水平踏板上随扶梯�上加速则有 A.踏板对人做的功等于人的机械能的增加量 B.踏板对人的支持力做 Template




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tomski如图2所示一个人稳站在商店的自动扶梯的水平踏板上随扶梯�上加速则有 a.踏板对人做的功等于人的机械能的增加量 b.踏板对人的支持力做 coloring