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Abstract
In recent years, the application of terahertz technology has gradually become more and more extensive. It has important research significance in physics, biomedicine, astronomy, material science and environmental science. Terahertz can also realize non-destructive testing of car body coatings. In the paper the authors introduce block-chain technology into the second-hand car information system. If it is supplemented by terahertz technology, it can improve the detection and identification of second-hand cars, to increase the transaction rate of the second-hand car market
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