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Railways
The means of conveyance of passengers and goods by way of wheeled vehicles running on rail tracks.
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半保留複製
Biology; Cell biology
DNAreplication DNA 螺旋是結清頭寸和每個鋼絞線的過程作為新的互補鏈,連結到舊的鋼絞線的合成的範本。因此,一個舊鋼絞線保留在每個新的分子。 ...