甲站在05ms匀速上行的自动扶梯上乙站在07ms匀速下行的自动扶梯上.甲乙两人质量相等甲上行中动能 选填“增加 “不变 Template




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tomski甲站在05ms匀速上行的自动扶梯上乙站在07ms匀速下行的自动扶梯上.甲乙两人质量相等甲上行中动能 选填“增加 “不变 coloring