一列火车在直的轨道上匀速行驶一人在火车上�上跳起�现仍落回原处这是因为 A.人跳起时会得到一个�前的冲力使它随火车一起�前运动b Template




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tomski一列火车在直的轨道上匀速行驶一人在火车上�上跳起�现仍落回原处这是因为 a.人跳起时会得到一个�前的冲力使它随火车一起�前运动b coloring