已知某一铁桥长1000m有一列火车从桥上通过测得火车开始上桥到完全过桥共有1min整列火车在桥上的时间为40s则火车的速度和车长分别为 Template




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tomski已知某一铁桥长1000m有一列火车从桥上通过测得火车开始上桥到完全过桥共有1min整列火车在桥上的时间为40s则火车的速度和车长分别为 coloring