Kev xa khoom thiab xav tau kev ua si cov nqi, steel kev lag luam siab nce Cov khoom siv hauv tsev steel raw khoom lag luam hloov pauv thiab sib sau ua ke, tus nqi ntawm cov hlau ore fluctuated me ntsis, tus nqi ntawm coke tseem ruaj khov, tus nqi ntawm cov seem steel tseem ruaj khov thiab muaj zog, thiab tus nqi ntawm billet. ros 30...
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