Hauv kev lag luam steel, cov kav dej steel, uas yog cov khoom siv hauv tsev tseem ceeb, tau siv dav hauv cov choj, cov tsev, kev thauj mus los, thiab lwm yam. Txawm li cas los xij, thaum lub sij hawm tsim khoom, cov kav hlau steel feem ntau raug deformation tshwm sim xws li khoov thiab sib tw vim ntau yam laj thawj, suc ...
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