Tau ntau xyoo, cov tsev steel tau txais kev muaj koob meej rau lawv cov kav ntev, kev ua tau zoo, thiab ntau yam.Txawm li cas los xij, ib qho tseem ceeb hauv kev tsim kho steel uas feem ntau tsis saib xyuas yog thermal rwb thaiv tsev.Yog tsis muaj rwb thaiv tsev zoo, cov tsev no c...
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